Publication date: 16th July 2025
Metal-halide perovskites (MHPs) have emerged as highly promising class of semiconducting materials for a broad range of optoelectronic applications. In solar cell technology, MHPs have demonstrated remarkable power conversion efficiencies exceeding 25% in single-junction devices [1]. Their outstanding photoluminescence quantum yields, tunable bandgaps, high carrier mobility, solution processability, and low fabrication cost have also made them highly effective in light-emitting diode (LED) applications [2]. Beyond photovoltaics and LEDs, MHPs have shown potential in devices such as field-effect transistors (FETs) [3]. Despite the extensive research focused on their optoelectronic performance, the investigation of their thermoelectric properties remains underexplored. In this study, we aim to contribute to the limited literature on the thermoelectric behavior of Sn2+-based perovskites by examining the properties of solution-processed FASnI3 thin films. Based on the synthesizing and film fabrication methodology of Ni Zhao et al. [3], we incorporated the additive FPEAI to enhance film crystallization and suppress structural defects. To further modulate the lattice characteristics, partial substitution with CsI was also performed to incorporate Cs+ into the crystal structure. The resulting films were systematically characterized through measurements of electrical conductivity, Seebeck coefficient, Hall effect, thermal conductivity, and heat capacity over a temperature range of 30oC to 90oC. These measurements provide insight into the structural, electronic, and thermal transport phenomena within the material. The investigation of thermoelectric properties in Sn2+-based perovskites represents an exciting and underdeveloped area within the broader perovskite research landscape. With their favorable electronic properties and potential for low thermal conductivity, these materials hold promise as earth-abundant and lead-free candidates for future thermoelectric applications. While the current study provides foundational insights, it also highlights the need for further systematic exploration to fully realize the thermoelectric potential of this material class.
We acknowledge the financial support from the European Research Council (ERC) through Consolidator Grant (818615-MIX2FIX).
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