Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.061
Publication date: 20th April 2022
We employ flash IR annealing to investigate the phase transition of formamidinium lead tridiode (FAPbI3) thin-films for their solar cell application. Measuring the enthalpy changes of FAPbI3 composition under different heating rates allows us to calculate an activation energy of 1.8 eV for the black perovskite phase transition.[1] We explore different heating rate regimes for triggering the phase transformation and analyze the evolution of the microstructure with an empirical calculation of the average crystal growth velocity required to form a compact film on the micron and submicron scale. The films were then optoelectronically and structurally correlated by mapping the typical microstructure of the grain domains, pointing to a direct relationship between film homogeneity and higher crystal growth rate. Accordingly, we manufactured highly stable black FAPbI3-based perovskite solar cells using the optimal film crystallization processing parameters, with an annealing time of just 640 ms. We achieve 18.5% power conversion efficiency (PCE) with the champion device in the absence of any additives or passivators, incurring merely a 10% loss in PCE during maximum power point tracking for 1500 h under full solar intensity exposure of the devices.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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