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InxGa1-xN/GaN Multiple Quantum Well Solar Cells with Conversion Efficiency of 3.77%
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作者 刘侍明 肖红领 +5 位作者 王权 闫俊达 占香蜜 巩稼民 王晓亮 王占国 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第8期185-188,共4页
We report on fabrication and photovoltaic characteristics of InxGa1-xN/GaN multiple quantum well solar cells with different indium compositions and barrier thicknesses. The as-grown samples are characterized by high- ... We report on fabrication and photovoltaic characteristics of InxGa1-xN/GaN multiple quantum well solar cells with different indium compositions and barrier thicknesses. The as-grown samples are characterized by high- resolution x-ray diffraction and reciprocal space mapping. The results show that the sample with a thick barrier thickness (lO.Onm) and high indium composition (0.23) has better crystalline quality. In addition, the dark current density-voltage (J-V) measurement of this device shows a significant decrease of leakage current, which leads to high open-circuit voltage Vow. Through the J-V characteristics under an Air Mass 1.5 Global (AM 1.5 G) illumination, this device exhibits a Voc of 1.89 V, a short-circuit current density Ysc of 3.92mA/cm2 and a fill factor of 50.96%. As a result, the conversion efficiency (77) is enhanced to be 3.77% in comparison with other devices. 展开更多
关键词 GAN In_xGa x)N/GaN Multiple Quantum Well Solar cells with conversion efficiency of 3.77
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The effect of transition metal ions (M^(2+)=Mn^(2+),Ni^(2+),Co^(2+),Cu^(2+)) on the chemical synthesis polyaniline as counter electrodes in dye-sensitized solar cells 被引量:2
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作者 Kezhong Wu Lei Chen +2 位作者 Weizhen Cui Bei Ruan Mingxing Wu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第5期671-675,共5页
The effect of transition metal ions(M^(2+)=Mn^(2+),Ni^(2+),Co^(2+),Cu^(2+)) on the chemical synthesis of polyaniline(PANI) used as a platinum-free counter electrode(CE) in dye-sensitized solar cells(DSSCs) was investi... The effect of transition metal ions(M^(2+)=Mn^(2+),Ni^(2+),Co^(2+),Cu^(2+)) on the chemical synthesis of polyaniline(PANI) used as a platinum-free counter electrode(CE) in dye-sensitized solar cells(DSSCs) was investigated.PANI was synthesized by co-polymerization of aniline in the presence of different transition metal ions by using potassium dichromate in acidic medium. It was found that the ion doping of PANI showed a certain catalytic activity for the regeneration of traditional iodide/triiodide(I^-/I_3^-) redox couples. The power conversion efficiency(η) of PANI CEs doped with Mn^(2+),Ni^(2+),Co^(2+) (4.41%, 2.36% and 2.10%, respectively) were higher than 1.94%, the value measured for PANI CE without doping. Doping with Cu^(2+)decreased the power conversion efficiency of PANI CE(PANI-Cu^(2+) η = 1.41%). The electrical properties of the PANI, PANI-Ni^(2+), PANI-Co^(2+),PANI-Mn^(2+) and PANI-Cu^(2+) were studied by cyclic voltammetry(CV), impedance(EIS), and Tafel polarization curve. The experimental results confirmed that PANI was affected by the doping of different transition metal ions(M^(2+)=Mn^(2+),Ni^(2+),Co^(2+),Cu^(2+)). These results indicate a potential application of ion doped PANI as counter electrode in cost-effective DSSCs. 展开更多
关键词 Dye-sensitized solar cell Counter electrode Polyaniline Transition metal ion Power conversion efficiency
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Layered-stacking of titania films for solar energy conversion:Toward tailored optical,electronic and photovoltaic performance 被引量:1
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作者 Wu-Qiang Wu Jin-Feng Liao Dai-Bin Kuang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第3期690-702,共13页
Nanostructured TiO2 with differentiate morphologies has attracted tremendous attention due to its wide band-gap nature as well as outstanding optical and electric properties for solar-driven light-toelectricity conver... Nanostructured TiO2 with differentiate morphologies has attracted tremendous attention due to its wide band-gap nature as well as outstanding optical and electric properties for solar-driven light-toelectricity conversion application. Layered-stacking TiO2 film such as double-layer, tri-layer, quadrupleor quintuplicate-layer, is highly desirable to the design of high-performance semiconductor material photoanodes and the development of advanced photovoltaic devices. In this minireview, we will summarize the recent progress and achievements on proof-of-concept of layered-stacking TiO2 films(LTFs) for solar cells with emphasis on the tailored properties and synergistic functionalization of LTFs, such as optimized sensitizer adsorption, broadened light confinement as well as facilitated electron transport characteristics.Various demonstrations of LTFs photovoltaic systems provide lots of possibilities and flexibilities for more efficient solar energy utilization that a wide variety of TiO2 with distinguished morphologies can be integrated into differently structured photoanodes with synergistic and complementary advantages. This key structure engineering technology will also pave the way for the development of next generation state-ofthe-art electronics and optoelectronics. Finally, from our point of view, we conclude the future research interest and efforts for constructing more efficient LTFs as photoelectrode, which will be highly warranted to advance the solar energy conversion process. 展开更多
关键词 TiO2 Charge transport Light scattering Power conversion efficiency Solar cells
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Titanylphthalocyanine as hole transporting material for perovskite solar cells
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作者 Mengna Sun Shirong Wang +2 位作者 Yin Xiao Zhihao Song Xianggao Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第6期756-761,共6页
Titanylphthalocyanine (TiOPc) as hole transporting material (HTM) was successfully synthesized by a simple process with low cost. Perovskite solar cells using the TiOPc as HTM were fabricated and characterized. Ti... Titanylphthalocyanine (TiOPc) as hole transporting material (HTM) was successfully synthesized by a simple process with low cost. Perovskite solar cells using the TiOPc as HTM were fabricated and characterized. TiOPc as HTM plays an important role in increasing the power conversion efficiency (PCE) by minimizing recombi- nation losses at the perovskite/Au interface because TiOPc as HTM can extract photogenerated holes from the perovskite and then transport quickly these charges to the back metal electrode. In the research, the β-TiOPc gives a higher PCE than α-TiOPc for the devices due to sufficient transfer dynamics, The β-TiOPc was applied in perovskite solar cells without clopping to afford an impressive PCE of 5.05% under AM 1.5G illumination at the thickness of 40 nm which is competitive with spiro-OMeTAD at the same condition. The present work suggests a guideline for optimizing the photovoltaic properties ofperovskite solar cells using the TiOPc as the HTM. 展开更多
关键词 Perovskite Solar cell Titanylphthalocyanine Hole transporting material Power conversion efficiency
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Synergistic effect of fluorination on both donor and acceptor materials for high performance non-fullerene polymer solar cells with 13.5% efficiency 被引量:21
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作者 Qunping Fan Wenyan Su +7 位作者 Yan Wang Bing Guo Yufeng Jiang Xia Guo Feng Liu Thomas P.Russell Maojie Zhang Yongfang Li 《Science China Chemistry》 SCIE EI CAS CSCD 2018年第5期531-537,共7页
A high performance polymer solar cells(PSCs) based on polymer donor PM6 containing fluorinated thienyl benzodithiophene unit and n-type organic semiconductor acceptor IT-4 F containing fluorinated end-groups were deve... A high performance polymer solar cells(PSCs) based on polymer donor PM6 containing fluorinated thienyl benzodithiophene unit and n-type organic semiconductor acceptor IT-4 F containing fluorinated end-groups were developed. In addition to complementary absorption spectra(300–830 nm) with IT-4 F, the PM6 also has a deep HOMO(the highest occupied molecular) level(-5.50 e V), which will lower the open-circuit voltage(V_(oc)) sacrifice and reduce the E_(loss) of the IT-4 F-based PSCs. Moreover, the strong crystallinity of PM6 is beneficial to form favorable blend morphology and hence to suppress recombination. As a result, in comparison with the PSCs based on a non-fluorinated D/A pair of PBDB-T:ITIC with a medium PCE of 11.2%, the PM6:IT-4 Fbased PSCs yielded an impressive PCE of 13.5% due to the synergistic effect of fluorination on both donor and acceptor, which is among the highest values recorded in the literatures for PSCs to date. Furthermore, a PCE of 12.2% was remained with the active layer thickness of up to 285 nm and a high PCE of 11.4% was also obtained with a large device area of 1 cm^2. In addition, the devices also showed good storage, thermal and illumination stabilities with respect to the efficiency. These results indicate that fluorination is an effective strategy to improve the photovoltaic performance of materials, as well as the both fluorinated donor and acceptor pair-PM6:IT-4 F is an ideal candidate for the large scale roll-to-roll production of efficient PSCs in the future. 展开更多
关键词 polymer solar cells fluorine substitution non-fullerene wide bandgap conjugated polymer power conversion efficiency
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Numerical simulation of the performance of the a-Si:H/a-SiGe:H/a-SiGe:H tandem solar cell 被引量:1
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作者 Ke Shaoying Wang Chong +2 位作者 Pan Tao Yang Jie Yang Yu 《Journal of Semiconductors》 EI CAS CSCD 2014年第3期91-96,共6页
The computer program AMPS-1D(analysis of microelectronic and photonic structures) has been employed to simulate the performance of the a-Si:H/a-SiGe:H/a-SiGe:H triple-junction solar cell at the radiation of AM1.5... The computer program AMPS-1D(analysis of microelectronic and photonic structures) has been employed to simulate the performance of the a-Si:H/a-SiGe:H/a-SiGe:H triple-junction solar cell at the radiation of AM1.5G(100 mW/cm2/ and room temperature. Firstly, three sub-cells with band gaps of 1.8, 1.6 and 1.4 eV are simulated, respectively. The simulation results indicate that the density of defect states is an important factor, which affects the open circuit voltage and the filling factor of the solar cell. The two-step current matching method and the control variate method are employed in the simulation. The results show that the best solar cell performance would be achieved when the intrinsic layer thickness from top to bottom is set to be 70, 180 and 220 nm, respectively. We also optimize the tunnel-junction structure of the solar cell reasonably, the simulation results show that the open circuit voltage, filling factor and conversion efficiency are all improved and the S-shape current density–voltage curve disappears during optimizing the tunnel-junction structure. Besides, the diagram of the energy band and the carrier recombination rate are also analyzed. Finally, our simulation data are compared to the experimental data published in other literature. It is demonstrated that the numerical results agree with the experimental ones very well. 展开更多
关键词 tandem solar cell conversion efficiency tunnel junction optical band gap current matching
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D-A structural protean small molecule donor materials for solution-processed organic solar cells 被引量:1
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作者 Qiong WU Dan Deng +1 位作者 Kun Lu Zhi-Xiang Wei 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第11期2065-2077,共13页
Under the synergistic effect of molecular design and devices engineering, small molecular organic solar cells have presented an unstoppable tendency for rapid development with putting forward donor- acceptor (D-A) s... Under the synergistic effect of molecular design and devices engineering, small molecular organic solar cells have presented an unstoppable tendency for rapid development with putting forward donor- acceptor (D-A) structures. Up to now, the highest power conversion efficiency of small molecules has exceeded 11%, comparable to that of polymers. In this review, we summarize the high performance small molecule donors in various classes of typical donor-acceptor (D-A) structures and discuss their relationships briefly. 展开更多
关键词 Small molecule donor materials Bulk heterojunction solar cells Donor-acceptor structures Molecule design Power conversion efficiency
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Rapid development in two-dimensional layered perovskite materials and their application in solar cells 被引量:2
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作者 Sajjad Ahmad Xin Guo 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第5期657-663,共7页
Two-dimensional (2D) layered organic-inorganic hybrid perovskite (2D PVK) materials have beenrecently developed as a novel candidate for photovoltaic application with high stability and a maximumpower conversion e... Two-dimensional (2D) layered organic-inorganic hybrid perovskite (2D PVK) materials have beenrecently developed as a novel candidate for photovoltaic application with high stability and a maximumpower conversion efficiency of 12.5%. This article summarized these newly emerging 2D PVK materialsand their uses in solar cells. The structural, physical, and chemical properties as well as the classificationof 2D PVK materials are discussed. The photovoltaic performance parameters of various 2D perovsldtesolar cells (2D PSCs) are summarized and their device stability is compared with conventional 3Dperovskite solar cells (3D PSCs). It has been concluded that 2D PVKs show greater stability upon humidity,heat stress, and light intensity as compared to 3D analogues and act as a class of promising materials forapplication in solar cells. 展开更多
关键词 Perovskite solar cells2D Perovskite materials2D Perovskite solar cellsStabilityPower conversion efficiency
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Enhanced open-circuit voltage in methoxyl substituted benzodithiophene-based polymer solar cells
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作者 Xiaonan Xue Yao Liu +4 位作者 Xiangyi Meng Xiaobo Sun Lijun Huo Wei Ma Yanming Sun 《Science China Chemistry》 SCIE EI CAS CSCD 2017年第2期243-250,共8页
The open-circuit voltage(V_(oc))is one of the important parameters that influence the power conversion efficiency(PCE)of polymer solar cells.Its value is mainly determined by the energy level offset between the highes... The open-circuit voltage(V_(oc))is one of the important parameters that influence the power conversion efficiency(PCE)of polymer solar cells.Its value is mainly determined by the energy level offset between the highest occupied molecular orbital(HOMO)of the donor and the lowest unoccupied molecular orbital(LUMO)of the acceptor.Therefore,decreasing the HOMO value of the polymer could lead to a high V_(oc)and thus increasing the cell efficiency.Here we report a facile way to lower the polymer HOMO energy level by using methoxyl substituted-benzodithiophene(BDT)unit.The polymer with the methoxyl functionl group(POBDT(S)-T1)exhibited a HOMO value of-5.65 eV,which is deeper than that(-5.52 eV)of polymer without methoxyl unit(PBDT(S)-T1).As a result,POBDT(S)-T1-based solar cells show a high V_(oc)of 0.98 V and PCE of 9.2%.In contrast,PBDT(S)-T1-based devices show a relatively lower V_(oc)of 0.89 V and a moderate PCE of 7.4%.The results suggest that the involvement of methoxyl group into conjugated copolymers can efficiencly lower their HOMO energy levels. 展开更多
关键词 polymer solar cell conjugated polymer HOMO open-circuit voltage power conversion efficiency
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Inverted polymer solar cells with Zn_2SnO_4 nanoparticles as the electron extraction layer
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作者 Xiao-Juan Huang Xiang Yao +4 位作者 Wen-Zhan Xu Kai Wang Fei Huang Xiong Gong Yong Cao 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第8期1755-1759,共5页
In this study, we report narrow-size distribution Zn_2SnO_4(ZSO) nanoparticles, which are produced by low-temperature solution-processed used as the electron extraction layer(EEL) in the inverted polymer solar ce... In this study, we report narrow-size distribution Zn_2SnO_4(ZSO) nanoparticles, which are produced by low-temperature solution-processed used as the electron extraction layer(EEL) in the inverted polymer solar cells(i-PSCs). Moreover, poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)](PFN) is used to modify the surface properties of ZSO thin film. By using the ZSO NPs/PFN as the EEL, the i-PSCs fabricated by poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b0] dithio-phene-2,6-diyl-altethylhexyl-3-fluorothithieno [3,4-b]thiophene-2-carboxylate-4,6-diyl](PTB7) blended with(6,6)-phenyl-C_(71)-butyric acid methylester(PC_(71)BM) bulk heterojunction(BHJ) composite, exhibits a power conversion efficiency(PCE) of 8.44%, which is nearly 10% enhancement as compared with that of7.75% observed from the i-PSCs by PTB7:PC_(71)BM BHJ composite using the ZnO/PFN EEL. The enhanced PCE is originated from improved interfacial contact between the EEL with BHJ active layer and good energy level alignment between BHJ active layer and the EEL. Our results indicate that we provide a simple way to boost efficiency of i-PSCs. 展开更多
关键词 Electron transport layer Zn_2SnO_4 nanoparticles Bulk heterojunction Power conversion efficiency Inverted polymer solar cells
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Organic functional materials based buffer layers for efficient perovskite solar cells
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作者 Fateh Ullah Hongzheng Chen Chang-Zhi Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第3期503-511,共9页
In this review, we highlight the recent development of organic π-functional materials as buffer layers in constructing efficient perovskite solar cells(PVSCs). By following a brief introduction on the PVSC developm... In this review, we highlight the recent development of organic π-functional materials as buffer layers in constructing efficient perovskite solar cells(PVSCs). By following a brief introduction on the PVSC development, device architecture and material design features, we exemplified the exciting progresses made in field by exploiting organic π-functional materials based hole and electron transport layers(HTLs and ETLs) to enable high-performance PVSCs. 展开更多
关键词 Perovskite solar cells Organic functional material Hole transport layer Electron transport layer Power conversion efficiency
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Facile and robust strategy to antireflective photo-curing coating through self-wrinkling 被引量:3
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作者 Honghao Hou Yanchang Gan +1 位作者 Xuesong Jiang Jie Yin 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第11期2147-2150,共4页
We reported a facile and bio-inspired strategy for obtaining antireflective (AR) coating through polymerization-induced self-wrinkling. Upon irradiation of light, the complex wrinkle micro-patterns with different mo... We reported a facile and bio-inspired strategy for obtaining antireflective (AR) coating through polymerization-induced self-wrinkling. Upon irradiation of light, the complex wrinkle micro-patterns with different morphologies were generated spontaneously on the surface of coating during photo-cross- linking, which enables the photo-curing coating can decrease reflection. The resulting photo-curing coating exhibits a high transmittance over 90% and low reflection below 5% ~ 8%, with an efficiency anti- reflection of 4% ~ 7%; compared to the flat blank coating. The successful application of these AR coatings with wrinkles pattern to encapsulate the thin film solar cells results in appreciable photovoltaic performance improvement of more than 4% ~ 8%, which benefits from the decrease of the light reflection and increase of optical paths in the photoactive layer by the introduction of wrinkling pattern. Furthermore, the efficiency improvements of the solar cells are more obvious, with a remarkable increase of 8.5%, at oblique light incident angle than that with vertical light incident angle 展开更多
关键词 Antireflective coating Photo-curing Self- wrinkling Surface pattern Thin film solar cell Enhanced power conversion efficiency
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