摘要
以含氧引达省并二噻吩(BDTP)为给电子核心,萘基稠合丙二腈(IN)和噻吩稠合丙二腈(CT)为吸电子共轭端基,设计合成了两个A-D-A型非富勒烯受体小分子BDTP-IN和BDTP-CT。对两个小分子的热稳定性,光学和电化学性质进行了研究,并以PTB7-Th为给体材料制备太阳能电池器件,研究了端基修饰对含氧引达省并二噻吩非富勒烯受体光伏性能的影响。结果表明,BDTP-IN分子由于萘端基的加入扩大了分子尺寸,影响了给受体间的共混,而以噻吩为端基的BDTP-CT分子尺寸较小,更好的调节了给受体的相分离尺度,得到基于BDTP-IN:PTB7-Th和BDTP-CT:PTB7-Th的最优器件的光电转换效率分别为2.48%和6.47%。本工作证明了端基类型和分子尺寸对以含氧引达省并二噻吩为给电子核心的A-D-A型非富勒烯受体光伏性能有重要影响。
Herein,two new A-D-A type oxygen atom substitution of indacenodithiophene non-fullerene acceptors,which contain naphthyl-fused or thiophene-fused acceptor unit and were labeled as BDTP-IN and BDTP-CT respectively,were synthesized to investigate the effects of end group and molecular size modification on photovoltaic performance of A-D-A type non-fullerene acceptor.Both materials exhibit idea thermal stability up to 330℃and broad absorption ranging from 550 to 850 nm.These features might be beneficial for obtaining reasonable stable and effective photovoltaic device.The highest occupied molecular orbital energy levels and lowest unoccupied molecular orbital energy levels(EHOMO/ELUMO)of BDTP-IN and BDTP-CT were measured and calculated to be-5.37/-3.83 eV and-5.40/-3.78 eV.,respectively.Conventional devices were fabricated based on BDTP-IN:PTB7-Th or BDTP-CT:PTBP-Th,and the photovoltaic performance of two non-fullerene acceptor materials were studied.After optimization of adding the additive 1,8-diiodooctane(DIO),overextended size of BDTP-IN make the molecules over aggregated thus leading to moderate power conversion efficiency(PCE)of 2.48%based on BDTP-IN:PTB7-Th,while the BDTP-CT:PTB7-Th based device showed a higher PCE of 6.47%.As the preliminary result,modification of the terminal end group exert influence on optical absorption spectrum,molecular energy level and morphology of active layer,and hence,significant changes on photovoltaic performance was resulted in the corresponding device.Overall,these findings might have significant implications for the rational end group design of novel A-D-A type non-fullerene acceptor materials.
作者
林瑶瑶
程畅
汪锋
Lin Yaoyao;Cheng Chang;Wang Feng(Key Laboratory for Green Chemical Process of Ministry of Education,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430073,China)
出处
《山东化工》
CAS
2020年第2期44-47,50,共5页
Shandong Chemical Industry
