In situ recombination junction between p-Si and TiO2 enables high-efficiency monolithic perovskite/Si tandem cells

Heping Shen, Stefan T. Omelchenko, Daniel A. Jacobs, Sisir Yalamanchili, Yimao Wan, Di Yan, Pheng Phang, The Duong, Yiliang Wu, Yanting Yin, Christian Samundsett, Jun Peng, Nandi Wu, Thomas P. White, Gunther G. Andersson, Nathan S. Lewis, Kylie R. Catchpole

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18 Citations (Scopus)

Abstract

Increasing the power conversion efficiency of silicon (Si) photovoltaics is a key enabler for continued reductions in the cost of solar electricity. Here, we describe a two-terminal perovskite/Si tandem design that increases the Si cell’s output in the simplest possible manner: by placing a perovskite cell directly on top of the Si bottom cell. The advantageous omission of a conventional interlayer eliminates both optical losses and processing steps and is enabled by the low contact resistivity attainable between n-type TiO2 and Si, established here using atomic layer deposition. We fabricated proof-of-concept perovskite/Si tandems on both homojunction and passivating contact heterojunction Si cells to demonstrate the broad applicability of the interlayer-free concept. Stabilized efficiencies of 22.9 and 24.1% were obtained for the homojunction and passivating contact heterojunction tandems, respectively, which could be readily improved by reducing optical losses elsewhere in the device. This work highlights the potential of emerging perovskite photovoltaics to enable low-cost, high-efficiency tandem devices through straightforward integration with commercially relevant Si solar cells.

Original languageEnglish
Article numbereaau9711
JournalScience Advances
Volume4
Issue number12
DOIs
Publication statusPublished - Dec 14 2018

ASJC Scopus subject areas

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    Shen, H., Omelchenko, S. T., Jacobs, D. A., Yalamanchili, S., Wan, Y., Yan, D., Phang, P., Duong, T., Wu, Y., Yin, Y., Samundsett, C., Peng, J., Wu, N., White, T. P., Andersson, G. G., Lewis, N. S., & Catchpole, K. R. (2018). In situ recombination junction between p-Si and TiO2 enables high-efficiency monolithic perovskite/Si tandem cells. Science Advances, 4(12), [eaau9711]. https://doi.org/10.1126/sciadv.aau9711