Simultaneous enhancement of the efficiency and stability of organic solar cells using PEDOT:PSS grafted with a PEGME buffer layer

被引：66
作者：
Lee, Jung Joon [1 ]
Lee, Seung Hwan [1 ]
Kim, Felix Sunjoo [2 ]
Choi, Hyang Hee [1 ]
Kim, Jung Hyun [1 ]
机构：
[1] Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea
[2] Chung Ang Univ, Dept Chem Engn & Mat Sci, Seoul 156756, South Korea
来源：
ORGANIC ELECTRONICS | 2015年 / 26卷
基金：
新加坡国家研究基金会;
关键词：
Organic solar cell; PEDOT:PSS; Condensation reaction; Work function; Stability; REDUCED GRAPHENE OXIDE; HOLE TRANSPORT LAYER; THIN-FILMS; POLYMER; CONDUCTIVITY; PERFORMANCE; PSS; PEDOT/PSS; ELECTRODE; LEVEL;
D O I：
10.1016/j.orgel.2015.07.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a simple processing method to simultaneously improve the efficiency and stability of organic solar cells (OSCs). Poly(4-styrene sulfonate)-doped poly(3,4-ethylenedioxy-thiophene (PEDOT:PSS), widely used as hole transport layer (HTL) in OSCs, tends to accelerate the degradation of devices because of its hygroscopic and acidic properties. In this regard, we have modified PEDOT: PSS to reduce its hygroscopic and acidic properties through a condensation reaction between PEDOT: PSS and poly(ethylene glycol) methyl ether (PEGME) in order to improve the efficiency and stability of OSCs. As a result, the power conversion efficiency (PCE) increased by 21%, from 2.57% up to 3.11%. A better energy level alignment by the reduced work function of the modified PEDOT: PSS with a highest occupied molecular orbital (HOMO) level of poly(3-hexylthiophene-2,5-diyl) (P3HT) is considered the origin of the improved the efficiency. The half-life of OSCs with PEDOT: PSS modified with PEGME buffer layer also increased up to 3.5 times compared to that of devices with pristine PEDOT: PSS buffer layer. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：191 / 199
页数：9
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