Efficient photovoltaic energy conversion in tetracene-C60 based heterojunctions

Chih-Wei Chu; Yan Shao; Shrotriya, Vishal; Yang Yang
June 2005
Applied Physics Letters;6/13/2005, Vol. 86 Issue 24, p243506
Academic Journal
We report organic solar cells fabricated with small-molecule organic semiconductor tetracene/C60 heterojunction as the photoactive layer. The external power conversion efficiency of the devices under AM 1.5 solar illumination at 100 mW/cm2 (1 sun) is 2.3±0.5% with relatively high open-circuit voltage (Voc=0.58±0.06 V) compared to most of the other small-molecular donor-acceptor (D-A) heterojunction solar cells reported so far. Using atomic force microscopy and x-ray diffraction we found that tetracene thin films consist of submicron-sized grains with rough surface and well defined molecular order. Therefore, using high mobility polycrystalline tetracene thin films for D-A heterojunction devices dramatically increases area of tetracene and C60 interface for exciton diffusion to reduce the recombination.


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