Correlation between the Open Circuit Voltage and the Energetics of Organic Bulk Heterojunction Solar Cells

被引：62

作者：

Lange, Ilja ^{[1
]}

Kniepert, Juliane ^{[1
]}

Pingel, Patrick ^{[1
]}

Dumsch, Ines ^{[2
]}

Allard, Sybille ^{[2
]}

Janietz, Silvia ^{[3
]}

Scherf, Ullrich ^{[2
]}

Neher, Dieter ^{[1
]}

机构：

[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[2] Berg Univ Wuppertal, Inst Polymer Technol, D-42097 Wuppertal, Germany

[3] Frauenhofer Inst Angew Polymerforsch, D-14476 Golm, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 22期

关键词：

CHARGE-TRANSFER; ELECTRONIC-STRUCTURE; POLYMER; RECOMBINATION; ENERGY; PHOTOGENERATION; SPECTROSCOPY; ABSORPTION; MORPHOLOGY; EFFICIENCY;

D O I：

10.1021/jz401971e

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：

A detailed investigation of the open circuit voltage (V-OC) of organic bulk heterojunction solar cells comprising three different donor polymers and two different fullerene-based acceptors is presented. Bias amplified charge extraction (BACE) is combined with Kelvin Probe measurements to derive information on the relevant energetics in the blend. On the example of P3HT:PC70BM the influence of composition and preparation conditions on the relevant transport levels will be shown. Moderate upward shifts of the P3HT HOMO depending on crystallinity are observed, but contrarily to common believe, the dependence of V-OC on blend composition and thermal history is found to be largely determined by the change in the PCBM LUMO energy. Following this approach, we quantified the energetic contribution to the V-OC in blends with fluorinated polymers or higher adduct fullerenes.

引用

页码：3865 / 3871

页数：7

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