Benzotrithiophene and benzodithiophene-based polymers for efficient polymer solar cells with high open-circuit voltage†,10.1039/C3PY00251A

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Lactoyl-CoA 全氟丁基戊烷白叶藤碱全氟己基辛烷新白叶藤碱壳寡糖特色专题-生物多肽

Benzotrithiophene and benzodithiophene-based polymers for efficient polymer solar cells with high open-circuit voltage†

Guobing Zhang,Jianyu Yuan,Jingxuan Ma,Hongbo Lu,Longzhen Qiu,Wanli Ma

Polymer Chemistry Pub Date : 03/22/2013 00:00:00 , DOI:10.1039/C3PY00251A

Abstract

Two new conjugated polymers based on benzodithiophene (BDT) and alkyl-benzotrithiophene (alkyl-BTT, P1), or acyl-benzotrithiophene (acyl-BTT, P2) were synthesized by a Stille cross-coupling reaction. The polymers were characterized by gel permeation chromatography (GPC), ultraviolet-visible (UV-vis) absorption as well as electrochemical cyclic voltammetry (CV) tests. Compared to the alkyl-BTT-based polymer (P1), the acyl-BTT-based polymer (P2) displayed a lower optical bandgap and a lower HOMO energy level. Polymer solar cells (PSCs) also confirmed that P2-based devices possessed better photovoltaic properties than those of P1-based devices. The optimized photovoltaic devices were fabricated with an active layer of a blend P2 and PC₇₁BM using 2 vol% 1,8-diiodooctane (DIO) as a solvent additive, and a PCE of 4.20% was obtained, with a V_oc as high as 0.96 V under AM 1.5G illumination at 100 mW cm⁻² with a solar simulator.