Organic-inorganic hybrid perovskite solar cell(PSC)is a third-generation photovoltaic technology^([1,2]),and the certi-fied power conversion efficiency(PCE)has reached 25.5%(https://www.nrel.gov/pv/cell-efficiency.htm...Organic-inorganic hybrid perovskite solar cell(PSC)is a third-generation photovoltaic technology^([1,2]),and the certi-fied power conversion efficiency(PCE)has reached 25.5%(https://www.nrel.gov/pv/cell-efficiency.html),which can rival solar cells based on crystalline-Si and other inorganic semi-conductors.The intrinsic instability of perovskite materials could impede PSC commercialization^([3]).To date,a variety of strategies such as composition engineering,additive engi-neering,interface engineering and encapsulation technique are employed to improve the long-term stability of PSCs^([4−9]).展开更多
All-inorganic CsPbI_(3-x)Br_(x)perovskite solar cells(PSCs)are advantageous in terms of high thermal stability,while its efficiency lags behind those of organic-inorganic hybrid perovskite counterparts.Defect passivat...All-inorganic CsPbI_(3-x)Br_(x)perovskite solar cells(PSCs)are advantageous in terms of high thermal stability,while its efficiency lags behind those of organic-inorganic hybrid perovskite counterparts.Defect passivations have been extensively applied for enhancing efficiency of all-inorganic PSCs,which are mainly based on univocal defect passivation of perovskite layer.Herein,we incorporated a bis-dimethylamino-functionalized fullerene derivative(abbreviated as PCBDMAM)as an interlayer between ZnO electron transport layer(ETL)and all-inorganic CsPbI_(2.25)Br_(0.75)perovskite layer,accomplishing synchronous defect passivations of both layers and consequently dramatic enhancements of efficiency and thermal stability of PSC devices.Upon spin-coating PCBDMAM onto ZnO ETL,the surface defects of ZnO especially oxygen vacancies can be effectively passivated due to the formation of Zn−N ionic bonds.In addition,PCBDMAM incorporation affords effective passivation of Pb_(I)and I_(Pb)antisite defects within the atop perovskite layer as well via coordination bonding with Pb^(2+).As a result,the regular-structure planar CsPbI_(2.25)Br_(0.75)PSC device delivers a champion power conversion efficiency(PCE)of 17.04%,which surpasses that of the control device(15.44%).Moreover,the PCBDMAM-incorporated PSC device maintains~80%of its initial PCE after 600 h heating at 85°C hot plate in N2 atmosphere,whereas PCE of the control device degrades rapidly to~62%after 460 h heating under identical conditions.Hence,PCBDMAM incorporation benefited dramatic improvement of the thermal stability of PSC device.展开更多
Wide-bandgap(≥1.68 eV)inverted perovskite solar cells(PSCs)have been recognized as promising top component cells on the commercial crystalline silicon cell to surpass its Shockley-Queisser efficiency limit.However,th...Wide-bandgap(≥1.68 eV)inverted perovskite solar cells(PSCs)have been recognized as promising top component cells on the commercial crystalline silicon cell to surpass its Shockley-Queisser efficiency limit.However,the power conversion efficiency(PCE)is dramatically limited by the huge open-circuit voltage(V_(OC))loss.Herein,we propose a proton-transfer-induced in situ defect passivation strategy to reduce the nonradiative recombination to minimize the VOC loss.Specifically,a liquid-form neutral amine,3,4,5-trifluorobenzylamine(TFBA)was added into ethyl acetate(EA)as anti-solvent for the film preparation,which induces proton-transfer from the formamidinium(FA)and methylammonium(MA)in the perovskite precursors to the TFBA.The protonated TFBA exhibits a gradient distribution near the surface of the perovskite film,achieving in situ defect passivation.As a result,TFBA-based 1.68 eV-bandgap inverted PSCs afforded a PCE of 20.39%,one of the highest for cells with this bandgap.Meanwhile,due to the strong interaction between TFBA and the perovskite film,the mixed-halide perovskites demonstrate much better photostability.Our findings offer an effective strategy to passivate defects in PSCs.展开更多
基金supported by the National Key Research and Development Program of China(2017YFA0402800)the National Natural Science Foundation of China(51925206,U1932214)+1 种基金the National Key Research and Development Program of China(2017YFA0206600)the National Natural Science Foundation of China(51773045,21772030,51922032,21961160720)for financial support.
文摘Organic-inorganic hybrid perovskite solar cell(PSC)is a third-generation photovoltaic technology^([1,2]),and the certi-fied power conversion efficiency(PCE)has reached 25.5%(https://www.nrel.gov/pv/cell-efficiency.html),which can rival solar cells based on crystalline-Si and other inorganic semi-conductors.The intrinsic instability of perovskite materials could impede PSC commercialization^([3]).To date,a variety of strategies such as composition engineering,additive engi-neering,interface engineering and encapsulation technique are employed to improve the long-term stability of PSCs^([4−9]).
基金This work was partially supported by the National Natural Science Foundation of China(Nos.51925206,U1932214,and 52172053)。
文摘All-inorganic CsPbI_(3-x)Br_(x)perovskite solar cells(PSCs)are advantageous in terms of high thermal stability,while its efficiency lags behind those of organic-inorganic hybrid perovskite counterparts.Defect passivations have been extensively applied for enhancing efficiency of all-inorganic PSCs,which are mainly based on univocal defect passivation of perovskite layer.Herein,we incorporated a bis-dimethylamino-functionalized fullerene derivative(abbreviated as PCBDMAM)as an interlayer between ZnO electron transport layer(ETL)and all-inorganic CsPbI_(2.25)Br_(0.75)perovskite layer,accomplishing synchronous defect passivations of both layers and consequently dramatic enhancements of efficiency and thermal stability of PSC devices.Upon spin-coating PCBDMAM onto ZnO ETL,the surface defects of ZnO especially oxygen vacancies can be effectively passivated due to the formation of Zn−N ionic bonds.In addition,PCBDMAM incorporation affords effective passivation of Pb_(I)and I_(Pb)antisite defects within the atop perovskite layer as well via coordination bonding with Pb^(2+).As a result,the regular-structure planar CsPbI_(2.25)Br_(0.75)PSC device delivers a champion power conversion efficiency(PCE)of 17.04%,which surpasses that of the control device(15.44%).Moreover,the PCBDMAM-incorporated PSC device maintains~80%of its initial PCE after 600 h heating at 85°C hot plate in N2 atmosphere,whereas PCE of the control device degrades rapidly to~62%after 460 h heating under identical conditions.Hence,PCBDMAM incorporation benefited dramatic improvement of the thermal stability of PSC device.
基金the Central Universities,Grant/Award Numbers:GK202103108,GK202103113National Natural Science Foundation of China,Grant/Award Number:62174103+2 种基金National University Research Fund,Grant/Award Number:2020TS105Overseas Talent Recruitment Project,Grant/Award Number:B14041111 Project,Grant/Award Number:B21005。
文摘Wide-bandgap(≥1.68 eV)inverted perovskite solar cells(PSCs)have been recognized as promising top component cells on the commercial crystalline silicon cell to surpass its Shockley-Queisser efficiency limit.However,the power conversion efficiency(PCE)is dramatically limited by the huge open-circuit voltage(V_(OC))loss.Herein,we propose a proton-transfer-induced in situ defect passivation strategy to reduce the nonradiative recombination to minimize the VOC loss.Specifically,a liquid-form neutral amine,3,4,5-trifluorobenzylamine(TFBA)was added into ethyl acetate(EA)as anti-solvent for the film preparation,which induces proton-transfer from the formamidinium(FA)and methylammonium(MA)in the perovskite precursors to the TFBA.The protonated TFBA exhibits a gradient distribution near the surface of the perovskite film,achieving in situ defect passivation.As a result,TFBA-based 1.68 eV-bandgap inverted PSCs afforded a PCE of 20.39%,one of the highest for cells with this bandgap.Meanwhile,due to the strong interaction between TFBA and the perovskite film,the mixed-halide perovskites demonstrate much better photostability.Our findings offer an effective strategy to passivate defects in PSCs.
