Perovskite Solar Cell-Thermoelectric Tandem System with a High Efficiency of Over 23%
Yangying Zhou a, Hong Lin a
a State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Oral, Yangying Zhou, presentation 074
Publication date: 11th February 2019

Photovoltaic-thermoelectric (PV-TE) tandem system has been considered as a viable approach to fully exploit solar energy by making full use of both solar light and heat generation. Herein, we demonstrate an efficient perovskite solar cell (PSC)-thermoelectric (TE) hybrid system with four-terminal configuration. To balance the light-to-electricity and heat-to-electricity efficiency and ultimately realize highly-efficient solar energy conversion, we performed both simulation and experiment by tuning the bandgap of top perovskite solar cell. Using perovskite with a composition of CH3NH3Pb(I0.95Br0.05)3 (band gap: 1.61 eV), we achieved a state-of-the-art efficiency of over 23% in this tandem system, with 18.3% from the PSC and the remaining 4.8% contributed by heat conversion using TE module. Our work proves that the low-grade heat produced by PSCs can be recovered and utilized by thermoelectric modules, and provides a promising route to improve the utilization rate of solar radiation based on PSCs.

This work was supported by the National Natural Science Foundation of China (NSFC, 51772166) and the Projects of International Cooperation and exchanges NSFC (51561145007)

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