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Matls 701/702: Fan Xu, MASc Candidate

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JHE A102

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materials@mcmaster.ca

Pyrrolidinium Lead Iodide from Crystallography: A Moisture and Thermal Dual Stable Perovskite for Photovoltaics

Overview

The growing demands for clean energy have made photovoltaics a popular research area. Among the many types, perovskite solar cells (PSC) attracted much attention due to their desirable properties, such as tunable bandgap, strong optical absorption, and long carrier diffusion lengths, making them a promising candidate for the practical applications. As a consequence, the power conversion efficiency (PCE) of PSCs has been improved drastically from 3.8% to 25.2%, within one decade of its original report in 2009. However, despite their impressive performance, a major bottleneck of commercialization remains. PSCs are not only unstable in humid environments, but also show poor thermal stability at the working temperature (85 oC).

In this presentation, a new perovskite possessing both thermal stability and water resistance has been constructed, involving pyrrolidinium rings (CH2)4NH2PbI3 (PyPbI3), through a simple solution-processing method. The crystal structure of PyPbI3 was determined and illustrated by single crystal X-ray diffraction. It presents not only prolonged moisture resistance and a favorable bandgap of 1.80 eV, as determined by P-XRD and UV absorption, but also excellent thermal stability, as verified via the in situ XRD technique. The new structure may be applicable to perovskite solar cells with improved thermal stability and water resistance.