A series of dithienobenzodithiophene based small molecules for highly efficient organic solar cells
A series of dithienobenzodithiophene based small molecules for highly efficient organic solar cells
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一系列基于二噻吩并苯并二噻吩的小分子，用于高效有机太阳能电池，
DOI：
10.1007/s11426-016-0461-1
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发表时间：
2017
影响因子：
9.6
通讯作者：
Chen Yongsheng
中科院分区：
文献类型：
--
作者：
Feng Huanran;Li Miaomiao;Ni Wang;Kan Bin;Wang Yunchuang;Zhang Yamin;Zhang Hongtao;Wan Xiangjian;Chen Yongsheng
以二噻吩并[2，3-d：2′，3 ′-d′]苯并[1，2-B：4，5-B′]二噻吩为中心结构单元，氰基乙酸辛酯、3-辛基绕丹宁和硫代巴比妥酸为端基，设计并合成了3种受体-供体-受体（A-D-A）小分子DCAODTBDT、DRDTBDT和DTBDTBDT作为溶液加工光伏电池（OPV）的给体材料.系统地研究了这些不同吸电子端基对共混膜的物理性质、能级、载流子迁移率、形貌及其光伏性能的影响。基于DRDTBDT的OPV器件的功率转换效率（PCE）最高，为8.34%，明显高于基于DCAODTBDT和DTBDTBDT的器件（PCE分别为4.83%和3.39%）。这些结果表明，相当专门和平衡的考虑吸收，能级，形态，流动性等的小分子为基础的OPV（SM-OPV）的设计和系统的研究是非常需要的，以实现高性能的SM-OPV。
Three acceptor-donor-acceptor (A-D-A) small molecules DCAODTBDT, DRDTBDT and DTBDTBDT using dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene as the central building block, octyl cyanoacetate, 3-octylrhodanine and thiobarbituric acid as the end groups were designed and synthesized as donor materials in solution-processed photovoltaic cells (OPVs). The impacts of these different electron withdrawing end groups on the photophysical properties, energy levels, charge carrier mobility, morphologies of blend films, and their photovoltaic properties have been systematically investigated. OPVs device based on DRDTBDT gave the best power conversion efficiency (PCE) of 8.34%, which was significantly higher than that based on DCAODTBDT (4.83%) or DTBDTBDT (3.39%). These results indicate that rather dedicated and balanced consideration of absorption, energy levels, morphology, mobility, etc. for the design of small-molecule-based OPVs (SM-OPVs) and systematic investigations are highly needed to achieve high performance for SM-OPVs.