Abstract
Power conversion efficiency (PCE) of the perovskite solar cells (PSCs) has remarkably been increased from 3.1% to 25.2%. The fast expansion of the PSCs has been along with the development of compositional and interface engineering, which has been playing a critical role. For the PSCs with record high-efficiency and stability, the perovskite absorber layer has been changed from the initial MAPbI3- to FAPbI3-based compositions. Owing to the enormous engineering works, perovskite absorber layers with monolithic grains could be achieved, in which the interior defects are negligible compared with the surface defects. Therefore, interface engineering, which can passivate the surface defects and/or isolate the perovskite from the environmental moistures, has been playing a more and more important role to further boost the PCE and stability of the PSCs. Herein, a compact review study of the compositional and interface engineering is presented and promising strategies and directions of the PSCs are discussed.
Highlights
Organic-inorganic metal halide perovskite solar cells (PSCs), as emerging photovoltaics, have attracted a lot of attention since the first PSC reported in 2009 (Kojima et al, 2009)
Significant progress has been achieved; for example, power conversion efficiency (PCE) has been increased from 3.1% to 25.2%, which makes PSCs exceed other thin-film solar cells and even the market leader polycrystalline silicon solar cells
We summarize that there is a clear trend of compositional change from the MAPbI3 to FAPbI3 perovskite used for the record high-efficiency PSCs
Summary
Organic-inorganic metal halide perovskite solar cells (PSCs), as emerging photovoltaics, have attracted a lot of attention since the first PSC reported in 2009 (Kojima et al, 2009). The most commonly used perovskite composition has been changed from the initial MAPbI3 to the so-called triple cation MAxFA0.95-xCs0.05Pb(I1-yBry) perovskite, and even toward the pure FAPbI3 perovskite for the record high-efficiency PSCs reported recently (Jiang et al, 2019; Kim et al, 2019; Min et al, 2019). The latter trend is due mainly to FA being thermally more stable than MA, and the band gap of
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