Application of phenonaphthazine derivatives as hole-transporting materials for perovskite solar cells

Two electron-rich, solution-processable phenonaphthazine derivatives, 5,12-bis(N-[4,4'-bis-(phenyl) aminophen-4 ''-yl]}-phenonaphthazine (BPZTPA) and 5,12-bis{N-[4,4'-bis(methoxy-phenyl)aminophen-4'-phenonaphthazine (MeO-BPZTPA) have been designed and employed in the fabrication of perovskite solar cells. BPZTPA and MeO-BPZTPA exhibit excellent thermal stabilities, hole mobilities (similar to 10(-4) cm(2)/(V.s)) and suitable HOMO levels (-5.34 and-5.29 eV, respectively) relative to the valence band of the CH3NH3PbI3 and Au work function, showing their potential as alternative hole-transporting materials (HTMs). Meanwhile, the corresponding mesoporous TiO2/CH3NH3PbI3/HTM/Au devices are investigated, and the best power conversion efficiency of 10.36% has been achieved for MeO-BPZTPA without using p-type dopant. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

Mixed Cations Enabled Combined Bulk and Interfacial Passivation for Efficient and Stable Perovskite Solar Cells

Here,we report a mixed GAI and MAI(MGM)treatment method by forming a 2D alternating-cation-interlayer(ACI)phase(n=2)perovskite layer on the 3D perovskite,modulating the bulk and interfacial defects in the perovskite films simultaneously,leading to the suppressed nonradiative recombination,longer lifetime,higher mobility,and reduced trap density.Consequently,the devices’performance is enhanced to 24.5%and 18.7%for 0.12 and 64 cm^(2),respectively.In addition,the MGM treatment can be applied to a wide range of perovskite compositions,including MA-,FA-,MAFA-,and CsFAMA-based lead halide perovskites,making it a general method for preparing efficient perovskite solar cells.Without encapsulation,the treated devices show improved stabilities.

Synthesis and Photoconductivity of Nanosized Phthalocyanine

Functional phthalocyanine （Pc） compounds of H2Pc, TiOPc, FePc and CIAIPc were synthesized with a yield of 46.7%, 91.2%, 37.4% and 34.0%, respectively. Nanosized TiOPc was synthesized via a one-step sol-gel method and effects of surfactant doses, nucleation temperature on TiOPc particle size and photoconductivity were investigated. When re（PEG）： m（TiOPc） was 0.1 and nucleation temperature was 0℃, the as-obtained TiOPc had the smallest particle size and largest specific surface area, which were 60 nm and 83m^2/g, respectively. TiOPc synthesized under these conditions also exhibits excellent photoconductivity with charging potential V0, dark decay speed Rd and energy for half-discharging of potential E1/2 being 1160 V, 30 V/s and 0.6 1x.s, respectively.

Titanylphthalocyanine as hole transporting material for perovskite solar cells

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.

通过调节交联空穴传输材料三线态能级实现溶液法制备高效的热活化延迟荧光有机电致发光二极管

具有高三线态能级的交联空穴传输材料能够平衡发光层载流子的复合并有效抑制三线态激子的猝灭,对制备高性能溶液法有机电致发光二极管具有重要意义.本文设计合成了两种具有不同母核的新型交联空穴传输材料,V-p-DBT和V-p-DBF.与已报道的交联空穴传输材料V-p-TPD相比,二苯并噻吩和二苯并呋喃母核的引入增加了分子的扭转角,使两种化合物具有更高的三线态能级,分别为2.57和2.64 e V.通过瞬态荧光光谱证明它们能够有效地抑制三线态激子的猝灭.交联的空穴传输层表现出优异的抗溶剂能力和溶液工艺所需的理化性质.其中,基于V-p-DBF的绿色热活化延迟荧光有机发光二极管获得了79.94 cd A-1的最大电流效率和24.35%的最大外量子效率.这项工作为实现溶液法制备的有机电致发光二极管提供了一种新的分子设计策略.

Synthesis and photoconductivities of bisazo charge generation materials

Six bisazo compounds were synthesized by coupling 2-(49-aminophenyl)-6-aminobenzoxazole as diazo component with N-phenyl-N9-(2-hydroxy-3-naphthoyl)urea derivatives,and characterized by ultraviolet and visible spectroscopy(UV-Vis),Fourier transform infrared spectroscopy(FT-IR)and elemental analysis(EA).Using these bisazo compounds as charge generation materials and CT-191(2-methyl-4-(N,N-dibenzyl)aminobenzoaldehyde-1,1-diphenylhydrazone)as charge transportation material,organic photoconductive devices were prepared.The result from photoconductivity measurement of the devices shows that the bisazo compound from N-(2-methylphenyl)-N9-(2-hydroxy-3-naphthoyl)urea has the best xerographic performance,V_(0)=600 V,V_(R)=30 V,R_(d)=15 V·s^(-1),E_(1/2)=3.5 lx·s.