Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Over the last 6 years, perovskite solar cells have emerged as a promising candidate because of mainly their efficiency. The efficiency has been rapidly improved from 3.8% to 22.1%[1,2]. An introduction of excessive PbI2 in perovskite layer which is understood to induce passivation within the film, improves the performance of MAPI3 perovskite photo-voltaic devices. The PbI2 passivation layer is easily formed by either pre or post annealing, or by changing the molar ratio of the precursor of perovskite between metal halide and cation. This results in optimized grain boundaries in the perovskites devices. However, the mechanisms of recombination and charge transport of these systems are not completely understood. In our study, we investigate the effect of PbI2 secondary phase introduced by post thermal annealing on MAPI3 films using Femto-Second Transient Absorption (fs-TAS) in combination with photoluminescence and electro-absorption spectroscopic techniques to unravel the excited state dynamics in perovskite films. This is then correlated to the crystallinity and morphology of PbI2 phase in MAPI3 film using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Our results demonstrate the effect of PbI2 on the perovskite device performance which plays an important role on the charge separation at the interface.
[1] J. Am. Chem. Soc., 2009, 131 (17), pp 6050–6051
[2] NREL.(http://www.nrel.gov/ncpv/)
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