Publication date: 16th July 2025
The tin halide perovskites are emerging as promising non-toxic photo-absorbers in solar cell devices, with a state-of-the-art power conversion efficiency (PCE) of ~17%.1,2 Despite these developments, the intrinsic phenomena particularly Tin oxidation (Sn+2 to Sn+4) followed by self p-doping, remain an Achille’s heel in the advancement of lead-free perovskite solar cells.3 The theoretical calculations suggest that tin oxidation is considerably futile in bulk, whereas it is energetically favoured at a non-passivated perovskite surface.4 We present robust strategies for surface passivation of the tin halide perovskites to gridlock the unwanted oxidation. In the talk, we shall highlight the recent understanding of solution chemistry and defect chemistry of tin perovskite solar cells.
References:
- He, D. et al. Nat. Nanotechnol. (2025).
- A.Abate, ACS Energy Lett. 8 (2023) 1896.
- Hao, F., et al., Adv. Energy Mater., 13, (2023)2300696
- D. Ricciarelli et al., ACS Energy Lett. 5 (2020) 2787.
We acknowledge the HYSPRINT Photovoltaics lab, EMIL labs, PVComB, and BESSY II light source at HZB for characterisation and measurements.
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