Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
For Sn-based perovskite solar cells (PSCs), the performance and long-term stability are the most challenging issues to be overcome to launch lead free PSCs in practical applications. In this case, the perovskite material itself has a facial tendency to oxidize from Sn2+ to Sn4+ and loses its favorable semiconducting properties for solar cells. Here, we present a coadditive engineering process with bifunctional organic additive to enhance the performance and stability of Sn-based PSCs. From the structural, morphological and elemental analysis, we revealed that the bifunctional groups of this additive anchor on the grain boundaries of perovskite through strong hydrogen bond formation with I- ion from SnI64- octahedron. The incorporation of this additive into the precursor solution also suppressed the Sn2+ oxidation and dark current density and enhanced the carrier lifetime. These positive aspects augmented the power conversion efficiency (PCE) from 3.3 % to 6.85%. More importantly, the operational stability was enhanced. The initial PCE of encapsulated PSCs remained unchanged up to 100 h at maximum power point tracing condition.
This work was party supported by JSPS KAKENHI grant No. 18H02079 (A.I). A.I. and J.L. acknowledges the support from NRF-2016M1A2A2940912. A.I. thanks H. Ohata at the Material Analysis Station of the National Institute for Materials Science for high-resolution XPS measurement.
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