Abstract
The current decay in response to a sudden change of applied bias up to 1 V has been measured on a methylammonium lead triiodide perovskite solar cell, for temperatures between 258 and 308 K.
Highlights
Since their invention in 2009,1 organometal halide perovskite solar cells have reached power conversion efficiencies (PCEs) of over 20%
In this article we explore the effects of ion motion in perovskite solar cells by measuring their dark current decay transients
We have used dark current decay transient measurements to probe the physical behaviour of perovskite solar cells
Summary
Since their invention in 2009,1 organometal halide perovskite solar cells have reached power conversion efficiencies (PCEs) of over 20%. Recent reviews of perovskite solar cell technologies are given by Sum et al.,[2] Stranks and Snaith,[3] Niu et al.,[4] Miyasaka[5] and Park.[6] Perovskites are the subject of a great deal of research interest due to their potential for easier and lower-cost manufacture than the market-leading silicon-based technologies. In most perovskite solar cells, the organometal halide perovskite absorber is sandwiched between an electron transporting (hole blocking) layer and a hole transporting (electron blocking) layer.[14] One of the most commonly used,[15] and longest used,[1] perovskites is methylammonium lead iodide (CH3NH3PbI3), or MAPI. The methylammonium (CH3NH3+) cation has been successfully replaced with formamidinium[16] (NH2CHNH2+) and/or caesium[17] (Cs+); a mixture of these cations can be used.[18,19] There are efforts to replace lead (Pb2+) with tin (Sn2+), though this usually comes at the expense of performance and stability.[20]
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