Efficiency enhancement for bulk-heterojunction hybrid solar cells based on acid treated CdSe quantum dots and low bandgap polymer PCPDTBT

被引：105

作者：

Zhou, Yunfei ^{[1
,2
]}

Eck, Michael ^{[1
,2
]}

Veit, Clemens ^{[3
]}

Zimmermann, Birger ^{[3
]}

Rauscher, Frank ^{[4
]}

Niyamakom, Phenwisa ^{[4
]}

Yilmaz, Seyfullah ^{[5
]}

Dumsch, Ines ^{[5
]}

Allard, Sybille ^{[5
]}

Scherf, Ullrich ^{[5
]}

Krueger, Michael ^{[1
,2
]}

机构：

[1] Univ Freiburg, Freiburg Mat Res Ctr FMF, D-79104 Freiburg, Germany

[2] Univ Freiburg, Inst Microsyst Technol IMTEK, D-79110 Freiburg, Germany

[3] Fraunhofer Inst Solar Energy Syst ISE, D-79110 Freiburg, Germany

[4] Bayer Technol Serv GmbH, Proc Technol, D-51368 Leverkusen, Germany

[5] Berg Univ Wuppertal, D-42097 Wuppertal, Germany

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2011年 / 95卷 / 04期

关键词：

Bulk-heterojunction solar cells; Hybrid solar cells; Quantum dot based photovoltaics; SEMICONDUCTOR NANOCRYSTALS; PHOTOVOLTAIC APPLICATIONS; CONJUGATED POLYMERS; NANOPARTICLES; PERFORMANCE; MORPHOLOGY; SIZE; POLY(3-HEXYLTHIOPHENE); COMPOSITES; CONVERSION;

D O I：

10.1016/j.solmat.2010.12.041

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：

We report on the efficiency enhancement for bulk-heterojunction hybrid solar cells based on hexanoic acid treated trioctylphosphine/oleic acid-capped CdSe quantum dots (QDs) and low bandgap polymer poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1 -6:3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) compared to devices based on poly(3-hexylthiophene) (P3HT). Photovoltaic devices with optimized polymer:QD weight ratio, photoactive film thickness, thermal annealing treatment, and cathode materials exhibited a power conversion efficiency of 2.7% after spectral mismatch correction, which is the highest reported value for spherical CdSe QD based photovoltaic devices. The efficiency enhancement is attributed to the surface treatment of the QDs together with the use of the low bandgap polymer PCPDTBT leading to an increased short-circuit current density due to additional light absorption between 650 and 850 nm. Our results suggest that the hexanoic acid treatment is generally applicable to various ligand-capped CdSe and confirm that low bandgap polymers with adequate HOMO and LUMO levels are promising to be incorporated into hybrid solar cells for further device performance improvement. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1232 / 1237

页数：6

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