期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 99, 期 -, 页码 176-181出版社
ELSEVIER
DOI: 10.1016/j.solmat.2011.11.006
关键词
Infrared; Heterojunction; Organic; Small molecule; Mismatch correction
资金
- Bundesministerium fur Bildung und Forschung (BMBF) [03IP602]
For high efficiencies, organic solar cells have to harvest a large part of the solar spectrum. However, in particular for small molecule based cells, efficient infrared absorbers are still rare. We investigate here two aza-bodipy dyes which have promising properties. Upon benzannulation of the pyrrole of difluorobora-1,3,5,7-tetraphenyl-aza-dipyrromethene (Ph-4-bodipy), the thin film absorption maximum is shifted by about 70-773 nm compared to the non-annulated molecule. The thin film properties of both materials are investigated and vacuum-processed solar cells using a mip-architecture (metal intrinsic p-doped) are compared. With the new benzannulated difluoro-bora-bis-(1-phenyl-indoyl)-azamethine (Ph-2-benz-bodipy) as donor material, these planar heterojunction solar cells show an open-circuit voltage of 0.65 V, a fill factor of 65%, and an external quantum efficiency extending up to 860 nm. The mismatch corrected power conversion efficiency reaches 1.1%. (C) 2012 Published by Elsevier B.V.
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