Small molecules based on thieno[3,4-c]pyrrole-4,6-dione for high open-circuit voltage (VOC) organic photovoltaics: effect of different positions of alkyl substitution on molecular packing and photovoltaic performance.
作者： Yoon Suk Choi , Tae Joo Shin , Won Ho Jo
DOI: 10.1021/AM505608S
关键词: Crystallography 、 Small molecule 、 Conjugated system 、 Energy conversion efficiency 、 Organic chemistry 、 HOMO/LUMO 、 Electrochemistry 、 Pyrrole 、 Materials science 、 Open-circuit voltage 、 Organic solar cell
摘要: Two different thienopyrroledione (TPD)-based small molecules (SMs) with alkyl substitution positions were synthesized, and their photovoltaic properties are measured compared to examine the effect of position on optical, electrochemical, properties. The use TPD as an electron-accepting unit in conjugated SMs effectively lowers highest occupied molecular orbital (HOMO) energy levels leads high open-circuit voltage (VOC). two n-hexyl group substituted at exhibit almost identical optical electrochemical pristine state. However, crystallographic morphological characteristics significantly different, because they blended PC71BM. SM which n-alkyl groups central accepting exhibits a power conversion efficiency (PCE) 6.0% VOC = 0.94 V, is among PCE values TPD-based S...
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