Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Methylammonium lead iodide (MAPbI3) and Methylammonium lead bromide (MAPbBr3) have emerged as a promising semiconductors for the fabrication of single crystal (SC) based photodetectors (PDs). However, there is still a lack of sufficient understanding of the effect of doping, passivation, ion migration, irradiation power, and applied temperature on the performance and stability of SC-based perovskite PDs. From the detailed bias- and temperature-dependent studies on MAPbI3 SC, we found that the low-frequency capacitance values are influenced by ion density and mobility.[1] The detailed analysis of the impact of different light intensities on the photodetection properties of SC-based PDs revealed that the key performance parameters of PD decrease with increasing irradiation intensity due to changes in charge recombination and carrier lifetime. On the other hand, the detrimental effect of increasing temperature on the performance of PD was found to be related to the ions accumulation, increasing scattering of impurities and phonons, change in conductivity, and band gap rather than the change in charge recombination. The small substitution of methylammonium (MA) with guanidinium (GUA) decreases the activation energy for iodide ion migration compared to pristine MAPbI3 SC.[2] The presence of large GUA cations in the 3D perovskite structure induces lattice enlargement, which perturbs the atomic interactions within the perovskite lattice. On the other hand, it is found that partial doping of Br in MAPbI3 SCs allowed the formation of a stable cubic phase at room temperature and showed much-improved crystal quality and stability as confirmed by corresponding low trap density, high activation energy, and high carrier mobility.[3] Still, all the SCs face instability against moisture. Therefore, surface passivation with less water solubility materials on MAPbI3 and MAPbBr3 SCs can improve the stability against moisture. We found that the lead sulfate (PbSO4) passivation layer on the SC helps to reduce ion migration by stabilizing the crystal surface and improving the electrical and hysteresis properties of the SCs at elevated temperatures.[4]
A.M. and D.P. acknowledge the National Science Centre (Grant OPUS-20, No. 2020/39/B/ST5/01497) for financial support
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