Thermochromic Pb-Organohalide Perovskite Solar Cells

Shaibal Sarkar^a, Ansuman Halder^a

^aIIT Indian Institute of Technology Bombay, India, Powai, Mumbai, Mumbai, India

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Ansuman Halder, 157
Publication date: 5th February 2015

Organic-inorganic hybrid perovskites (mainly Methylammonium Lead halides) recently emerged as highly promising light harvesting materials for photovoltaic applications. A major boost in the field of perovskite solar cells was experienced with the efficiency of perovskite based solar cells reaching ca. >20% within a matter of a few years. Here we report, formation of non-stoichiometric Methylammonium Lead Iodide perovskite [(CH₃NH₃)_nPbI₃] as a thermochromic material. The material shows visible, and importantly reversible, color changes with in the temperature range ca. 50-60^oC. The temperature dependent color change of the material was studied by UV-VIS spectroscopy. The thermochromicity of the perovskite material was found to be due to the formation and deformation of perovskite structure at high temperature and low temperature respectively, as studied by in-situ temperature dependent X-ray diffraction. We further applied the thermochromic property in photovoltaic devices. Devices when heated to desired temperature, give photovoltaic activity (ca. ɳ = 1-2%), otherwise transparent. We believe that this set of materials could potentially be used in building integrated PV, specially in smart-windows.

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