Graphene quantum dots-incorporated cathode buffer for improvement of inverted polymer solar cells

被引：49
作者：
Yang, Hong Bin [1 ]
Dong, Yong Qian [1 ]
Wang, Xizu [3 ]
Khoo, Si Yun [1 ]
Liu, Bin [1 ]
Li, Chang Ming [1 ,2 ]
机构：
[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore
[2] Southwest Univ, Inst Clean Energy & Adv Mat, Chongqing 400715, Peoples R China
[3] Inst Mat Res & Engn, Singapore 117602, Singapore
来源：
SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2013年 / 117卷
关键词：
Graphene; Quantum dots; Cesium carbonate; Organic solar cells; Exciton dissociation; Charge recombination; PHOTOVOLTAIC CELLS; FULLERENE;
D O I：
10.1016/j.solmat.2013.05.060
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：
Graphene quantum dots (GQDs) are an emerging class of nanomaterials with unique photonic and electric properties. In this study, GQDs were prepared by a facile, inexpensive and high-yield hydrothermal method and were further used as a cathode buffer additive for inverted polymer solar cells due to a wide band gap (similar to 3.3 eV) and well-matched energy level between GQDs-cesium carbonate (GQD5-Cs2CO3) modified indium tin oxide (3.8 eV) and high occupied molecular orbit of [6,61-phenylC61-butyric acid methyl ester (3.7 eV). In comparison to inverted polymer solar cells using cesium carbonate (Cs2CO3) buffer layer, the power conversion efficiency of GQD5-Cs2CO3 based device showed 22% enhancement from 2.59% to 3.17% as a result of enhanced exciton dissociation and suppressed free charge recombination at cathode/polymer active layer interface by GQDs. This work provides a new application of GQDs in organic electronic devices. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：214 / 218
页数：5
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