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

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

doi:10.1126/sciadv.aau9711

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

Journal Article · Fri Dec 14 00:00:00 EST 2018 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aau9711· OSTI ID:1610792

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^[1]; Yalamanchili, Sisir ^[2];

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^[3]; Samundsett, Christian ^[1]; Peng, Jun ^[1]; Wu, Nandi ^[1];

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Australian National Univ., Canberra, ACT (Australia)
California Institute of Technology (CalTech), Pasadena, CA (United States)
Flinders Univ., Adelaide, SA (Australia)

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.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Australian Research Council; Australian Renewable Energy Agency (ARENA)

Grant/Contract Number:: SC0004993; LE0989068; MG005; FT13010916

OSTI ID:: 1610792

Journal Information:: Science Advances, Vol. 4, Issue 12; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 113 works

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