Open-Circuit Voltage Limitation in Low-Bandgap Diketopyrrolopyrrole-Based Polymer Solar Cells Processed from Different Solvents

被引:42
作者
Boix, Pablo P. [1 ]
Wienk, Martijn M. [2 ,3 ]
Janssen, Rene A. J. [2 ,3 ]
Garcia-Belmonte, Germa [1 ]
机构
[1] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, ES-12071 Castellon de La Plana, Spain
[2] Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands
[3] Eindhoven Univ Technol, Dept Chem & Chem Engn, NL-5600 MB Eindhoven, Netherlands
关键词
EFFICIENCY; CONVERSION;
D O I
10.1021/jp203279f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Low-bandgap diketopyrrolopyrrole-based polymer bulk-heterojunction solar cells prepared from different solvents are studied by means of capacitance measurements. Large variations of both photovoltage and photocurrent are induced during device processing by using different solvents that allow internal operating energetics to be addressed. Addition of o-dichlorobenzene to chloroform produces an upward offset of the polymer highest occupied molecular orbital level in accordance with the red shift of the absorption spectra, which correlates with the flat-band potential offset extracted from Mott-Schottky analysis of the reverse and low-forward capacitance. However, the open-circuit voltage does not reach the expected value in the case of chloroform-processed devices because of the reduced occupancy of the acceptor fullerene lower unoccupied molecular orbital states extracted from the chemical capacitance analysis under illumination. This photovoltage loss is linked with the limitation to the increase in the electron Fermi level caused by the reduced charge density involved in the photovoltaic process, as derived from the morphology-influenced short-circuit current density.
引用
收藏
页码:15075 / 15080
页数:6
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