Recent Progress on Boosting the Perovskite Film Quality of All-Inorganic Perovskite Solar Cells

Abstract

All-inorganic CsPbX3 perovskite material not only has the benefits of advanced light absorption coefficient, long carrier lifetime, and simple preparation process of organic–inorganic perovskite materials but it also maintains excellent stability under the erosion of damp heat. Stability is the premise of its industrialization, so all-inorganic perovskite is undoubtedly a very competitive direction for the development of perovskite materials. However, there are still many defects in the all-inorganic perovskite thin films, and it is difficult to obtain high power conversion efficiency (PCE). This review systematically summarizes additive engineering, solvent engineering, and interface engineering methods to promote the thin film property for a high PCE in recent years.

Carbon Electrodes for Perovskite Photovoltaics: Interfacial Properties, Meta‐analysis, and Prospects

“…spiro-OMeTAD, for example, is among the most commonly employed HSLs in conventional-architecture devices. [68,69] However, the p-type dopants necessary to improve the charge transport capacity of the neat material contribute to poor longterm stability. Lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) absorbs ambient moisture, and 4-tert-butylpyridine (TBP) evaporates from the film, leading to the formation of voids and pinholes (Figure 3).…”

Hindered Phase Transition Kinetics of α‐CsPbI3 by External Tension

“…[22,23] Many attempts have been made to resolve this challenge, including interface engineering, strain engineering, doping, and encapsulation etc. [18,21,24] For example, DMAI and the derivative have been widely adopted as an additive for the high performance of CsPbI 3 solar cells, which slightly enhanced the stability of such devices, due possibly to the tensile strain caused by the oversized DMA þ ions in the A site. [25][26][27] However, others argue that DMAI may react with CsPbI 3 , forming double-cation hybrid perovskite Cs 1-x DMA x PbI 3 , which acted as a dopant instead of an additive.…”

“…[19] The highest reported light stability for such a device is 1000 h, far from enough for commercialization. [20,21] Worse off, the presence of water vapor in the air could accelerate the phase change, resulting in a shorter lifetime. [22,23] Many attempts have been made to resolve this challenge, including interface engineering, strain engineering, doping, and encapsulation etc.…”

“…[ 19 ] The highest reported light stability for such a device is 1000 h, far from enough for commercialization. [ 20,21 ] Worse off, the presence of water vapor in the air could accelerate the phase change, resulting in a shorter lifetime. [ 22,23 ]…”

Recent Progress of Film Fabrication Process for Carbon-Based All-Inorganic Perovskite Solar Cells

“…The most effective way to improve the long-term stability and thermal stability of PSCs is to completely replace the organic component of A in the ABX 3 with an inorganic component [23,24]. Since 2015, researchers have revealed that cesium lead halide PSCs have an excellent stability and the unencapsulated devices can operate continuously and stably for over 900 h at 100 • C [23,[25][26][27]. In particular, hole-transporting materials (HTM)free carbon-based cesium lead halide PSCs (C-IPSCs) exhibit two distinct advantages.…”