Effects of inter-molecular charge-transfer excitons on the external quantum efficiency of zinc-porphyrin/C60 heterojunction photovoltaic cells

被引：11
作者：
Ryuzaki, Sou [1 ]
Kai, Toshihiro [1 ]
Toda, Yasunori [2 ]
Adachi, Satoru [2 ]
Onoe, Jun [1 ,3 ]
机构：
[1] Tokyo Inst Technol, Dept Nucl Engn, Tokyo 1528550, Japan
[2] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan
[3] Tokyo Inst Technol, Nucl Reactors Res Lab, Tokyo 1528550, Japan
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2011年 / 44卷 / 14期
关键词：
POLYMER SOLAR-CELLS; FILMS;
D O I：
10.1088/0022-3727/44/14/145103
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have examined the structural effects of zinc-octaethylporphyrin [Zn(OEP)] films used as a donor on the external quantum efficiency (EQE) of organic heterojunction photovoltaic (OPV) cells [ITO/Zn(OEP)/C-60/Al], and investigated what exactly causes the improvement of EQE. When the structure of the Zn(OEP) films changed from amorphous to crystalline, the maximum EQE increased from 36% to 42%, which is greater than that of around 35% for previously reported OPV cells using buffer materials (Peumans and Forrest 2001 Appl. Phys. Lett. 79 126). The crystallization of Zn(OEP) films is found to increase the number of inter-molecular charge-transfer (IMCT) excitons and to enlarge the mobility of carriers and IMCT excitons, thus significantly improving the EQE of the photoabsorption band under illumination due to the IMCT excitons.
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页数：4
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