New insights into charge extraction and formation of the band-bending region in Schottky junction organic solar cells

Sibi Sutty; Graeme Williams; Hany Aziz

doi:10.1117/12.2023416

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17 October 2013 New insights into charge extraction and formation of the band-bending region in Schottky junction organic solar cells

Sibi Sutty, Graeme Williams, Hany Aziz

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Proceedings Volume 8830, Organic Photovoltaics XIV; 88300L (2013) https://doi.org/10.1117/12.2023416
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

Abstract

Schottky junction organic solar cells were recently introduced and have demonstrated surprising performance with high open circuit voltage and short circuit current. In this study, the formation of the band bending region and charge extraction from the donor molecules in C₆₀ and C₇₀ based Schottky junction solar cells are investigated. Band bending was observed when the ITO anode was treated with CF₄O₂ and O₂ plasma. These cells demonstrated similar performance to cells with MoO₃ coated ITO, which are more common in literature. The presence of donor material at the anode interface was also found to decrease the open circuit voltage of the cell by decreasing the number of fullerene molecules at the anode and consequently, decreasing the extent of band bending. The short-circuit current of the Schottky junction solar cells increased when a thin layer of neat fullerene was introduced between the ITO anode and the donor doped mixed layer by reducing exciton quenching at the anode interface. Finally, hole extraction from the donor was found to be efficient up to 5 nm away from the anode interface. If donor molecules were placed beyond this distance the fill factor dropped precipitously along with the overall cell efficiency.

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Sibi Sutty, Graeme Williams, and Hany Aziz "New insights into charge extraction and formation of the band-bending region in Schottky junction organic solar cells", Proc. SPIE 8830, Organic Photovoltaics XIV, 88300L (17 October 2013); https://doi.org/10.1117/12.2023416

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