Alleviating hysteresis and improving device stability of perovskite solar cells via alternate voltage sweeps

Abstract

The anomalous hysteresis in a perovskite solar cell induced by an asymmetric field is confirmed by a capacitancevoltage measurement. By applying several cycles of alternating reverse and forward scans, this hysteresis phenomenon is obviously alleviated, resulting in a hysteresis-less state in the perovskite solar cell. Meanwhile, the open-circuit voltage and power conversion efficiency of the perovskite solar cell are enhanced by 55.74% and 61.30%, respectively, while the current density and fill factor keep almost invariable. The operation of alleviating hysteresis is essential for further research and is likely to bring in performance gains.

Perovskite solar cells: short lifetime and hysteresis behaviour of current–voltage characteristics

“…The rate and the voltage range of data collection, and the direction of applying external bias voltage change the shape of I-V curves and hence the device parameters. In general I-V curves measured starting from reverse bias voltages show better characteristics than those measured starting from forward bias voltages [3][4][5][6][7][8][9][10]. This behaviour can also be other way around depending on the materials and device processing steps used [5].…”

Promise of commercialization: Carbon materials for low-cost perovskite solar cells

“…Since the pioneering work of Kojima et al who introduced CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbBr 3 as light absorbers in a liquid-state perovskitesensitized solar cell in 2009, PVSCs have allured intensive studies both from the academic world and industrial community. [6][7][8][9] With thousands of publications and increasing attempts to commercialization, PVSCs gradually become an almost matured technology during the past eight years. [10] PVSCs usually consist of matrix-supported transparent conductive oxide (TCO) anode, charge selective contact layer (hole/electron transport layer or H(E)TL), perovskite absorbed layer, second charge selective contact layer (electron/hole transport layer), and cathode.…”

Carbon-based electrodes for perovskite solar cells

“…Through the comparison of the data, the J – V curve measured from the reverse bias voltage had better performance than the J – V curve measured from the forward bias voltage. 133,160–163 The PSCs showed dramatic instability under atmospheric conditions. 127,164–166 To overcome this detrimental effect, it was important to find out the cause of this phenomenon in C-PSCs.…”