Revisiting the origin of open circuit voltage in nanocrystalline-TiO2/polymer heterojunction solar cells

被引：32
作者：
Al-Dmour, H. [1 ]
Taylor, D. M. [1 ]
机构：
[1] Bangor Univ, Sch Elect Engn, Bangor LL57 1UT, Gwynedd, Wales
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 22期
关键词：
nanostructured materials; organic semiconductors; photoconductivity; photovoltaic effects; semiconductor heterojunctions; solar cells; titanium compounds; OXYGEN; TIO2; ATMOSPHERES; PERFORMANCE; TRANSPORT;
D O I：
10.1063/1.3153122
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Recent reports suggest that the open circuit voltage, V-OC, in polymeric heterojunction solar cells is determined by the energy difference between the highest occupied molecular orbital of the electron donor and the lowest unoccupied molecular orbital of the electron acceptor. Here we show that in solar cells formed from nanocrystalline titanium dioxide (nc-TiO2) and poly(3-hexylthiophene) (P3HT), V-OC may arise from a depletion region at the nc-TiO2/P3HT interface, which only forms in the presence of oxygen. Under illumination in vacuum, photovoltaic behavior is swamped by a significant increase in photoconduction enabled by reduced electron trapping in the absence of oxygen.
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