Annealing temperature dependence of the efficiency and vertical phase segregation of polymer/polymer bulk heterojunction photovoltaic cells

被引：23
|
作者：
Murari, Nishit M.
Crane, Matthew J.
Earmme, Taeshik
Hwang, Ye-Jin
Jenekhe, Samson A. [1 ]
机构：
[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 22期
关键词：
POLYMER SOLAR-CELLS; NAPHTHALENE DIIMIDE; SELF-ORGANIZATION; COPOLYMER; DONOR;
D O I：
10.1063/1.4880941
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-polymer bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b] selenophene copolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 degrees C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the polymer/polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy polymer (P3HT) migrated to the bulk, while the high surface energy polymer (PNDISS) enriches at the substrate/blend interface. (C) 2014 AIP Publishing LLC.
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页数：5
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