Recombination-Limited Photocurrents in Low Bandgap Polymer/Fullerene Solar Cells

被引：372

作者：

Lenes, Martijn ^{[1
]}

Morana, Mauro ^{[2
]}

Brabec, Christoph J. ^{[2
]}

Blom, Paul W. M. ^{[1
]}

机构：

[1] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands

[2] Konarka Austria, A-4040 Linz, Austria

来源：

ADVANCED FUNCTIONAL MATERIALS | 2009年 / 19卷 / 07期

关键词：

SPECTRAL RESPONSE; CHARGE-TRANSPORT; POLYMER; POLYFLUORENE; PERFORMANCE; VINYLENE);

D O I：

10.1002/adfm.200801514

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The charge transport and photogeneration in solar cells based on the low bandgap-conjugated polymer, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H- cyclopenta[2,1-b; 3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and fullerenes is studied. The efficiency of the solar cells is limited by a relatively low fill factor, which contradicts the observed good and balanced charge transport in these blends. Intensity dependent measurements display a recombination limited photocurrent, characterized by a square root dependence on effective applied voltage, a linear dependence on light intensity and a constant saturation voltage. Numerical simulations show that the origin of the recombination limited photocurrent stems from the short lifetime of the bound electron-hole pairs at the donon/acceptor interface.

引用

页码：1106 / 1111

页数：6

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