화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.55, No.4, 699-706, 2017
The Effect of Tuning Chemical Structure on the Open-Circuit Voltage and Photovoltaic Performance of Narrow Band-Gap Polymers
Most of the narrow band-gap polymers exhibit low open-circuit voltage (V-oc) which limits the further improvement of photovoltaic performance. How to improve the V-oc through fine tuning of the chemical structure is a significant project that worth exploring. As a big and strong electron accepting unit, fluorinated-quinoxaline based copolymers always show a narrow band gap and broad absorption which makes it a good template to study the changes of V-oc through structure tuning. In this work, the effect of the subtle chemical structure modulation of polymer side chains and main chain on the V-oc and photovoltaic performance was investigated. The V-oc was adjusted effectively, and the power conversion efficiency (PCE) also was improved simultaneously. Although the PCE was not high enough as those high-performance polymers reported at present, the result indicates that fine tuning of chemical structure is an effective way to improve V-oc and photovoltaic performance for narrow band-gap polymers. (C) 2016 Wiley Periodicals, Inc.