Formation of new bulk-heterojunction structure in organic thin film solar cells

Takahiro Osasa; Shuhei Yamamoto; Shou Sasaki; Michio Matsumura

doi:10.1117/12.732792

12 November 2007 Formation of new bulk-heterojunction structure in organic thin film solar cells

Takahiro Osasa, Shuhei Yamamoto, Shou Sasaki, Michio Matsumura

Proceedings Volume 6656, Organic Photovoltaics VIII; 66560N (2007) https://doi.org/10.1117/12.732792
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

Organic solar cells were fabricated by stacking aromatic amine and C₆₀ layers. The energy conversion efficiency of these solar cells was low because of poor photoabsorption by these layers and short diffusion length of excitons. However, the photocurrent density was increased by about 3 times by the application of heat treatment to the stacked organic layers at about 140 °C, and the maximum energy conversion efficiency reached 1.1% under AM 1.5, 100 mW/cm² simulated solar light. The effect of the heat treatment was attributed to the infiltration of the amorphous aromatic amine compound into grain boundaries of the microcrystalline C₆₀ layer. From observation by electron microscopy, the mixed form of these two compounds near the interface was found to be suited to solar cells because the C₆₀ and aromatic amine phases wedge each other in a direction normal to two electrodes.

Citation Download Citation

Takahiro Osasa, Shuhei Yamamoto, Shou Sasaki, and Michio Matsumura "Formation of new bulk-heterojunction structure in organic thin film solar cells", Proc. SPIE 6656, Organic Photovoltaics VIII, 66560N (12 November 2007); https://doi.org/10.1117/12.732792

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KEYWORDS

Telescopic pixel displays

Solar cells

Annealing

Heat treatments

Electrodes

Interfaces

Molecules

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