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Rubidium multication perovskite with optimized bandgap for perovskite-silicon tandem with over 26% efficiency

Duong, T, Wu, Y, Shen, H, Peng, J, Fu, X, Jacobs, D, Wang, E-C, Kho, TC, Fong, KC, Stocks, M, Franklin, E ORCID: 0000-0002-8146-2770, Blakers, A, Zin, N, McIntosh, K, Li, W, Cheng, Y-B, White, TP, Weber, K and Catchpole, K 2017 , 'Rubidium multication perovskite with optimized bandgap for perovskite-silicon tandem with over 26% efficiency' , Advanced Energy Materials, vol. 7, no. 14 , pp. 1-11 , doi: 10.1002/aenm.201700228.

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Abstract

Rubidium (Rb) is explored as an alternative cation to use in a novel multication method with the formamidinium/methylammonium/cesium (Cs) system to obtain 1.73 eV bangap perovskite cells with negligible hysteresis and steady state efficiency as high as 17.4%. The study shows the beneficial effect of Rb in improving the crystallinity and suppressing defect migration in the perovskite material. The light stability of the cells examined under continuous illumination of 12 h is improved upon the addition of Cs and Rb. After several cycles of 12 h light–dark, the cell retains 90% of its initial efficiency. In parallel, sputtered transparent conducting oxide thin films are developed to be used as both rear and front transparent contacts on quartz substrate with less than 5% parasitic absorption of near infrared wavelengths. Using these developments, semi-transparent perovskite cells are fabricated with steady state efficiency of up to 16.0% and excellent average transparency of ≈84% between 720 and 1100 nm. In a tandem configuration using a 23.9% silicon cell, 26.4% efficiency (10.4% from the silicon cell) in a mechanically stacked tandem configuration is demonstrated which is very close to the current record for a single junction silicon cell of 26.6%.

Item Type: Article
Authors/Creators:Duong, T and Wu, Y and Shen, H and Peng, J and Fu, X and Jacobs, D and Wang, E-C and Kho, TC and Fong, KC and Stocks, M and Franklin, E and Blakers, A and Zin, N and McIntosh, K and Li, W and Cheng, Y-B and White, TP and Weber, K and Catchpole, K
Keywords: perovskite, solar cells
Journal or Publication Title: Advanced Energy Materials
Publisher: Wiley
ISSN: 1614-6840
DOI / ID Number: 10.1002/aenm.201700228
Copyright Information:

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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