材料科学
聚合物太阳能电池
共轭体系
聚合物
轨道能级差
带隙
能量转换效率
接受者
热稳定性
电子迁移率
Stille反应
高分子化学
光电子学
侧链
光化学
有机化学
化学
复合材料
物理
分子
凝聚态物理
作者
Xunchang Wang,Jinhui Tong,Pengzhi Guo,Yuda Li,Hui Li,Yangjun Xia,Rui Wang
出处
期刊:Polymer
[Elsevier]
日期:2017-07-01
卷期号:122: 96-104
被引量:18
标识
DOI:10.1016/j.polymer.2017.06.047
摘要
Three two-dimensional (2D) conjugated polymers, named PBDTSDPP-1, PBDTSDPP-2, and PBDTSDPP-3, based on benzo[1,2-b:4,5-b’]dithiophene (BDT) donor unit with conjugated alkylthiothiophene side chain and diketopyrrolopyrrole (DPP) acceptor unit, were designed and synthesized via palladium-catalyzed Stille-coupling reaction. The resulting polymers exhibited good thermal stability with a high decomposition temperature over 350 °C and a broad absorption in the range from 400 to 900 nm. The HOMO energy levels of the polymers are deeper than −5.39 eV and the LUMO energy levels of them are higher than −4.09 eV. The field effect transistors prepared from PBDTSDPP-1, PBDTSDPP-2 and PBDTSDPP-3 provide a hole mobility of 3.52 × 10−3, 3.85 × 10−4 and 4.36 × 10−3 cm2 V−1 s−1, respectively. The photovoltaic properties of the polymer as donor was investigated with an inverted structure of ITO/PEIE/polymer:PC71BM/MoO3/Ag. As a preliminary result, PBDTSDPP-1, PBDTSDPP-2, and PBDTSDPP-3 showed power conversion efficiency (PCE) of 4.75%, 3.56%, and 5.28%, respectively. The short-circuit current density (JSC) and PCE value of PSCs based on PBDTSDPP-3 are higher than those of the other two polymers because of better morphology, higher and more balanced charge-carrier mobilities, leading to less recombination loss.
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