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.
Highlights
Perovskite solar cells (PSCs) have become the front runner in emerging thin-film solar cells, with power conversion efficiency (PCE) exceeding 25% owing to their low-cost solution processing and exciting optoelectronic features such as their high absorption coefficient, tunable stability, and superior carrier transportation properties [1,2,3,4,5,6,7,8]
A prototypical perovskite solar cells (PSCs) with an architecture consisting of fluorine-doped tin oxide (FTO)/compact
The current–voltage (J–V) characteristics of the device were measured under air mass 1.5 global (AM 1.5 G) irradiance using the Bio-Logic galvanostat in the dark and with different light intensities
Summary
Perovskite solar cells (PSCs) have become the front runner in emerging thin-film solar cells, with power conversion efficiency (PCE) exceeding 25% owing to their low-cost solution processing and exciting optoelectronic features such as their high absorption coefficient, tunable stability, and superior carrier transportation properties [1,2,3,4,5,6,7,8]. The key issue that hampers the commercialization of PSCs is device instability under light, moisture, and high-temperature exposure [9,10]. There are two types of instability for PSCs. One is the intrinsic chemical instability of the perovskite absorber layer, and the other is associated to the electronic properties of the device [10]. One is the intrinsic chemical instability of the perovskite absorber layer, and the other is associated to the electronic properties of the device [10] The latter includes ion migration and inefficient charge transport, which lead to the hysteresis phenomenon and light soaking under operational conditions [11].
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