With an aim to reduce the cost of depleted-heterojunction colloidal quantum dot solar cells, we describe herein a strategy that replaces costly Au with a low-cost Ni-based Ohmic contact. The resultant devices achieve 3.5% Air Mass 1.5 power conversion efficiency. Only by incorporating a 1.2-nm-thick LiF layer between the PbS quantum dot film and Ni, we were able to prevent undesired reactions and degradation at the metal-semiconductor interface.
Depleted-heterojunction colloidal quantum dot photovoltaics employing low-cost electrical contacts
Ratan Debnath, Mark T. Greiner, Illan J. Kramer, Armin Fischer, Jiang Tang, D. Aaron R. Barkhouse, Xihua Wang, Larissa Levina, Zheng-Hong Lu, Edward H. Sargent; Depleted-heterojunction colloidal quantum dot photovoltaics employing low-cost electrical contacts. Appl. Phys. Lett. 12 July 2010; 97 (2): 023109. https://doi.org/10.1063/1.3463037
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