Changes in the Electrical Characteristics of Perovskite Solar Cells with Aging Time

Abstract

The last decade has witnessed the impressive progress of perovskite solar cells (PSCs), with power conversion efficiency exceeding 25%. Nevertheless, the unsatisfactory device stability and current–voltage hysteresis normally observed with most PSCs under operational conditions are bottlenecks that hamper their further commercialization. Understanding the electrical characteristics of the device during the aging process is important for the design and development of effective strategies for the fabrication of stable PSCs. Herein, electrochemical impedance spectroscopical (IS) analyses are used to study the time-dependent electrical characteristics of PSC. We demonstrate that both the dark and light ideality factors are sensitive to aging time, indicating the dominant existence of trap-assisted recombination in the investigated device. By analyzing the capacitance versus frequency responses, we show that the low-frequency capacitance increases with increasing aging time due to the accumulation of charges or ions at the interfaces. These results are correlated with the observed hysteresis during the current–voltage measurement and provide an in-depth understanding of the degradation mechanism of PSCs with aging time.

1T-Rich 2D-WS2 as an interfacial agent to escalate photo-induced charge transfer dynamics in dopant-free perovskite solar cells

“…The carrier recombination behaviour was further assessed by the semilogarithmic J-V curve in the dark (Figure 4e). By fitting the exponential region of the curve with the Shockley equation that is given by [45][46]…”

The effect of storage cycle on improvement in the photovoltaic parameters of planar triple cation perovskite solar cells

“…Some papers reported the value of ideality factor for aged and pristine devices, suggesting that the unity value of n indicates the dominance of recombination at the surface of the perovskite film, whereas n id < 2 refers to trap-assisted Shockely-Read-Hall (SRH) recombination in the perovskite bulk. 46,67 Authors found that for aged devices was dominant SRH recombination. For our devices the ideality factor was calculated from the slope of V oc vs ln( ph /) reported in Fig.…”

“…In literature several studies have been made to measure the charge transfer, such as time-of-flight secondaryion mass spectrometry, glow discharge optical emission spectrometry, transient photovoltage decay measurements and electrochemical impedance spectroscopy. 21,22,67,[72][73][74] These analyses could give more information on charge transport in PSCs especially when hysteresis-free devices are obtained. Further investigation could be planned to study ambient air stored devices adding information on charge recombination when PV parameters increase over time, by linking results with fabrication and storage processes.…”

High throughput screening of promising lead-free inorganic halide double perovskites via first-principles calculations

“…However, traditional solar energy utilization devices have relatively high costs and low efficiencies and are less economical than conventional energy sources, which severely restricts the use of solar energy. 1–6 As the third-generation solar cell, the photoelectric conversion efficiency of perovskite solar cells (PSCs) has increased rapidly in the past decade. 7–10 Moreover, PSCs are rich in synthetic raw materials with a relatively low preparation cost, providing a more feasible approach for low-cost and high-efficiency solar energy utilization.…”