Abstract
Perovskite solar cells (PSCs) based on methylammonium lead mixed halide (CH3NH3PbI3−xClx) are highly promising for next generation photovoltaic technology owing to their low-cost facile fabrication and superior performance. The power conversion efficiency (PCE) and stability of PSCs are immensely influenced by the crystallinity, homogeneity, uniformity, and defect density of the perovskite films. This work highlights an efficient solution processing route utilizing Chlorobenzene (CB) as an antisolvent during the thin film growth process. It is demonstrated that the planar perovskite film prepared by the CB-modified method yields a homogeneous deposition with a significant reduction in pin holes and defect density. Inverted planar heterojunction PSCs fabricated by this method exhibit a higher open circuit voltage (Voc) and reduced non-radiative recombination as compared to that obtained in PSCs prepared without CB. The improved film quality results in a huge enhancement of nearly 40% in the PCE. In addition, a significant reduction in the charge carrier's transfer resistance from 2442 to 550 Ω was observed while the defect density was suppressed from 24.6 × 1016 to 11.1 × 1016 cm−3. These CB-modified PSCs also exhibit improved stability in the ambient conditions. This approach would pave the way for the fabrication of low-temperature processed inverted planar PSCs with improved performance.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by DG, AKC, VP, SPK, PJ and CS. The first draft of the manuscript was written by DG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Gupta, D., Veerender, P., Sridevi, C. et al. Enhanced optical and electronic properties of chlorobenzene-assisted perovskite CH3NH3PbI3−xClx film incorporated in p-i-n solar cells. J Mater Sci: Mater Electron 34, 66 (2023). https://doi.org/10.1007/s10854-022-09516-8
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DOI: https://doi.org/10.1007/s10854-022-09516-8