Articles written in Bulletin of Materials Science

    • Two-step fabrication of MAPbI$_3$ perovskite thin films with improved stability


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      Perovskite solar cells (PSCs) are a part of an emerging technology in photovoltaics (PV), which uses perovskite structured hybrid compounds as light absorbers such as methylammonium lead iodide (CH$_3$NH$_3$PbI$_3$ or MAPbI$_3$). PSCs with a record certified efficiency of 22.1% are among the fastest advancing PV technology; but PSCs suffer from fast degradationin the presence of moisture. PSCs prepared by a solution process have additional limitation of small device area. In order to improve the stability of perovskite layer, we have used a two-step method for depositing a perovskite layer. First step is the thermal evaporation of lead iodide (PbI$_2$) and second is dip coating (DC) in methylammonium iodide (CH$_3$NH$_3$I or MAI) solution to prepare a MAPbI$_3$ perovskite. At the same time, we have also used conventional spin coating (SC) for PbI$_2$ films and DC in MAI to obtain MAPbI$_3$ for a comparative study. The gradual formation of MAPbI$_3$ after dipping a PbI$_2$ film into MAI solution can be seen from X-ray diffraction patterns. Structural, optical and electrical properties of the MAPbI$_3$ films are also studied. Better stability of perovskite films was observed using vapour-deposited PbI$_2$ films as compared with spin-coated PbI$_2$ films.

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