Phase controlled all-polymer bulk-heterojunction photovoltaic cells with high open-circuit voltage

被引：14

作者：

Chen, Lin ^{[2
]}

Yang, Ligong ^{[1
]}

Shi, Minmin ^{[2
]}

Chen, Hongzheng ^{[2
]}

机构：

[1] Zhejiang Univ, Zhejiang California Int Nanosyst Inst, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromol Synth & Functionalizat, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2010年 / 94卷 / 12期

基金：

新加坡国家研究基金会; 中国国家自然科学基金;

关键词：

All-polymer solar cell; Open-circuit voltage; Phase segregation; Bulk heterojunction; Secondary phase transition; SOLAR-CELLS; TRANSPORT PROPERTIES; CHARGE GENERATION; POLYFLUORENE; BLENDS; DEVICES; POLY(3-HEXYLTHIOPHENE); PERFORMANCE; MORPHOLOGY; SEPARATION;

D O I：

10.1016/j.solmat.2010.07.019

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

All-polymer bulk-heterojunction photovoltaic cells based on poly(N-vinyl carbazole) and poly(9, 9-dioctyffiuorene-co-benzothiadiazole) co-casting films are investigated. One of the highest reported open-circuit voltage among the all-polymer solar cells is obtained due to the large energy offset between the highest occupied molecular orbital of the donor and the lowest unoccupied molecular orbital of the acceptor. Atomic force microscopy and photoluminescence study of the active layer with varied blending ratios and annealing temperatures reveals a phase controlled working mechanism, in which the charge generation efficiency is proved to be the main limiting factor of this material system. The incident photon-to-current conversion efficiency measurement shows a unique "double peak" phenomenon with increase in the annealing temperature, indicative of asynchronous chain movement between the two polymers due to their relatively large difference in glass transition temperature. Such a phase behavior might have potential value in further optimization of film morphology towards higher device performance. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2244 / 2250

页数：7

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