Abstract
The rapid pace of development for hybrid perovskite photovoltaics has recently resulted in promising figures of merit being obtained with regard to device stability. Rather than relying upon expensive barrier materials, realizing market‐competitive lifetimes is likely to require the development of intrinsically stable devices, and to this end accelerated aging tests can help identify degradation mechanisms that arise over the long term. Here, oxygen‐induced degradation of archetypal perovskite solar cells under operation is observed, even in dry conditions. With prolonged aging, this process ultimately drives decomposition of the perovskite. It is deduced that this is related to charge build‐up in the perovskite layer, and it is shown that by efficiently extracting charge this degradation can be mitigated. The results confirm the importance of high charge‐extraction efficiency in maximizing the tolerance of perovskite solar cells to oxygen.
Highlights
The rapid pace of development for hybrid perovskite photovoltaics has recently resulted in promising figures of merit being obtained with regard to device stability
Rather than relying upon expensive barrier materials, realizing market-competitive lifetimes is likely to require the development these semiconductors have led to the demonstration of proof-of-concept PV devices with an initial efficiency that outperforms competing ‘next-generation’ technologies such as dye-sensitized, organic, and of intrinsically stable devices, and to this end accelerated aging tests can quantum dot solar cells, and even matches help identify degradation mechanisms that arise over the long term
Transient photocurrent and photovoltage measurements have been used to give insight into the behavior of model CH3NH3PbI3−XClX perovskite solar cells operating in the presence of oxygen
Summary
Compact TiO2 and doped Spiro-MeOTAD were used as electron- and hole-transporting layers, respectively, in the reference solar cells (see the Experimental Section for details). An initial stabilized PCE was determined by first measuring the cell photocurrent during a reverse bias scan and subsequently monitoring the photocurrent at the maximum
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