Examining the influence of temperature coefficients of perovskite tandem photovoltaics under real-world conditions
Sam Teale a, Henry Snaith a
a Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, OX1 3PU, United Kingdom
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Poster, Sam Teale, 063
Publication date: 18th October 2023

As the commercial prospects for perovskite tandem photovoltaics improve, there is increasing emphasis on understanding the effects of real-world conditions on these devices. We fabricated high efficiency perovskite/Si (30.8% PCE) and all-perovskite (25.4% PCE) tandems and tested them over a range of temperatures. Opposing temperature dependence with bandgap - perovskite bandgaps widen with increasing temperature whereas Si narrows - results in a worse temperature coefficient for perovskite/Si (-0.22%) compared to all-perovskite tandems (-0.18%). We demonstrate, however, that it is possible to alter the perovskite structure so that its bandgap narrows with temperature, resulting in an improved temperature coefficient with Si (-0.19%). Predicting energy yields from this data using real-world temperature and spectral data we find that this improved temperature coefficient does not translate to higher energy yields. Surprisingly we find that the opposing temperature/bandgap correlation in perovskite/Si tandems is often an advantage, one that is not accurately considered under current protocols.

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