Impact of Capacitive Effect and Ion Migration on the Hysteretic Behavior of Perovskite Solar Cells

Abstract

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Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

“…Charge accumulation induced by ion migration in the perovskite layer is held responsible for the hysteresis. [15,16] In contrast, most reports have shown negligible hysteresis in the planar p-i-n PVSC with fullerene as the electron transport layer. [17][18][19] The striking www.advenergymat.…”

Ionic charging by local imbalance at interfaces in hybrid lead halide perovskites

“…Local ionic rearrangement gives rise to measurable capacitances, which produce capacitive currents and concomitant hysteresis behavior as recently shown for hybrid lead iodide perovskite-based solar cells. 16,17 With the aim of separating bulk from interface mechanisms, thick MAPbI 3 pellets of different thickness (400-800 lm) are sandwiched between Au contacts (see Figure S1 in supplementary material). 18 The synthesis of CH 3 NH 3 PbI 3 was carried by slow evaporation in gamma-butyrolactone containing stoichiometric amounts of methyl ammonium iodide and lead iodide.…”

Absence of ferroelectricity in methylammonium lead iodide perovskite

“…It has been shown that various parameters such as, applied voltage, sweep rate, polarity, 17 bias history, 18,19 light-exposure, 18,19 and even device configuration can affect the hysteresis in the I-V characteristics. Several mechanisms have been proposed to explain the hysteretic I-V characteristics of PSCs, namely slow transient capacitive current, 17,20,21 trapping-detrapping of the charge carriers at the various interfaces and the grain boundaries, 22,23 ion migration, 18,20,[23][24][25][26] and finally ferroelectricity of the lead halide perovskite layer. 19,27,28 Recently, there have been numerous conflicting reports regarding ferroelectricity in perovskites.…”

“…Presence of these slow dynamic ionic charges in CH 3 NH 3 PbI 3 perovskites has been reported in literature. 18,20,[23][24][25][26] It has been shown that the slow current response in CH 3 NH 3 PbI 3 perovskites is due to CH 3 NH 3 + or Pb 2+ ions. 39 Later it was confirmed that CH 3 NH 3 + is migrating ionic species in the layer.…”