Fine-tuning of Polymer Photovoltaic Properties by the Length of Alkyl Side Chains  

作　　者：秦瑞平 Yu-rong Jiang Hao-xing Zhang Kai-xuan Zhang Qun-ying Zhang 常方高 

机构地区：[1]College of Physics & Electronic Engineering,Key Laboratory of Photovoltaic Materials of Henan Province,Henan Normal University

出　　处：《Chinese Journal of Polymer Science》2015年第3期490-498,共9页高分子科学（英文版）

基　　金：financially supported by the Postdoctoral Starting Foundation of Henan Normal University(01026500105);Young Scientists Foundation of Henan Normal University(01026400061);Henan Province basic and frontier technology research projects(1323004100247)

摘　　要：This paper reports the synthesis and characteristics of a series of alkyl-substituted planar polymers. The physical properties are carefully tuned to optimize their photovoltaic performance. Depending on the length of soluble alkyl side chains which modify the structural order and orientation substantially in polymer backbones, the device performance can be improved significantly. The tuning of HOMO energy levels optimized polymers＇ spectral coverage of absorption and their hole mobility, as well as miscibility with fullerene; all these efforts enhanced polymer solar cell performances. The short- circuit current, Jsc for polymer solar cells was increased by adjusting polymer chain packing ability. It was found that films with well distributed polymer/fullerene interpenetrating network exhibit improved solar cell conversion efficiency. Enhanced efficiency up to 5.8% has been demonstrated. The results provide important insights about the roles of flexile chains in structure-property relationship for the design of new polymers to be used in high efficient solar cells.This paper reports the synthesis and characteristics of a series of alkyl-substituted planar polymers. The physical properties are carefully tuned to optimize their photovoltaic performance. Depending on the length of soluble alkyl side chains which modify the structural order and orientation substantially in polymer backbones, the device performance can be improved significantly. The tuning of HOMO energy levels optimized polymers＇ spectral coverage of absorption and their hole mobility, as well as miscibility with fullerene; all these efforts enhanced polymer solar cell performances. The short- circuit current, Jsc for polymer solar cells was increased by adjusting polymer chain packing ability. It was found that films with well distributed polymer/fullerene interpenetrating network exhibit improved solar cell conversion efficiency. Enhanced efficiency up to 5.8% has been demonstrated. The results provide important insights about the roles of flexile chains in structure-property relationship for the design of new polymers to be used in high efficient solar cells.

关 键 词：Polymer solar cells Alkyl side chains MORPHOLOGY Charge mobility. 

分 类 号：O631.2[理学—高分子化学] TM914.4[理学—化学]