About this Research Topic
Recently, the National Renewable Energy Laboratory (NREL) in the US has announced a new world record of power conversion efficiency (PCE) in organic-inorganic hybrid perovskite (OHP) based solar-cell. The PCE was 22.7 %, with significant competition with CdTe (22.1 %), CIGS (22.6 %), and Si (25.4 %). (In the case of a perovskite/silicon tandem solar-cell, a 25.2% PCE was recently published.) The fast development, only nine years, was surprising, and now this OHP is becoming a compelling candidate to replace the current commercial material, silicon. Many researchers are thinking about the end of the PCE race and need now to focus more on a fundamental viewpoint. Until now, the research goal in OHP-based solar-cells was pretty clear: “to make an OHP-based solar-cell with easy fabrication, high PCE, and stable performance.” The result of this goal looks very successful now.
Understanding of defect structure in organic-inorganic hybrid perovskite materials is a crucial point to explain several physical properties such as material stability, energy band, carrier mobility, and so on. In solar-cell application using organic-inorganic hybrid perovskite materials, in particular, it is essential to make a more advanced device with high efficiency and stability. This research viewpoint is standard on semiconductor industrials, and we already used defect effects such as n-/p-type doping to control the carriers by adding a donor or acceptor level in the bandgap. Also, we expect the organic-inorganic hybrid perovskite-based solar cell to be improved further after this defect study.
In this Research Topic, we are focusing on the kind of defect, the roles/effects of the defect, how to control/remove defects, and the positive/negative aspects to solar-cell application. Finally, we would like to suggest fundamental defect structure as a field of study for future research on organic-inorganic hybrid perovskite materials.
All article types are accepted.
Keywords: defect structure, electronic structure, organic-inorganic hybrid perovksite, solar cell, thin film, atomic structure, atomic/electronic structure
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