面向高稳定性太阳能电池开发的卤化物钙钛矿稳定 性提升策略

Abstract

Perovskite is rising as the most promising material for the next generation of solar cells, due to its high efficiency, low cost, and convenient fabrication. However, the stability of perovskite solar cells remains to be a challenge towards large-scale application. Perovskite materials play a key role in improving the stability of PSCs, and tremendous efforts have been committed to stabilizing the perovskite materials, including composition regulation, crystallization control, and interface optimization. Herein we review the state-of-the-art strategies to improve the stability of perovskite layers in PSCs, and important strategies are highlighted. We analyze in-depth the influence of each site ion on perovskite structural stability and summarize the important progress of these structures showing superior stability. We then summarize the use of additives to regulate perovskite crystallization and defect passivation and elaborate the related mechanisms. Furthermore, the pros and cons of different interface treatment methods used in perovskite solar cells are discussed

Synergistic Surface Defect Passivation of Ionic Liquids for Efficient and Stable MAPbI3-Based Inverted Perovskite Solar Cells

“…where ε, ε 0 , L, V TFL , and e are perovskite relative permittivity, vacuum permittivity, perovskite-film thickness, limit voltage full of traps, and elementary charge, respectively. For the control and DADA-treated devices, the calculated electronand hole-trap densities were (4.10 and 3.12 × 10 16 ) and (2.30 and 1.90 × 10 15 ) cm −3 , respectively. Therefore, DADA substantially reduced both the electron-and hole-trap densities, which improved the PSC performance.…”

“…Because of their ionic properties, which are related to organic-cation and halide vacancies and uncoordinated lead and iodine ions, perovskites contain various defects, which are often mainly concentrated at grain boundaries and on perovskite surfaces. − These defects capture charges, which generates nonradiative recombination and hysteresis and, thus, affects the device performance. − In addition, defects promote ion migration and charge accumulation in the device, which destroys the device structure and considerably reduces both the device stability and performance. − In the early development of PSCs, researchers mainly focused on the improvement of the perovskite active layer by engineering components, , optimizing fabrication processes, , engineering solvents, , and modifying interfaces by passivating defects − to reduce the defect densities of perovskite active layers. Interfacial modification is a facile and effective method for reducing the number of surface defects.…”

A review on conventional perovskite solar cells with organic dopant-free hole-transport materials: roles of chemical structures and interfacial materials in efficient devices

“…5,6 With respect to MHPs, they are sensitive to external stimulations such as moisture, heat, and oxygen. Over the last decade, tremendous efforts have been devoted to understanding the degradation mechanisms of MHPs and developing strategies for robust MHPs, 7 which have recently translated into impressive progress. 8 Ho-Baillie and Shi et al demonstrated that the outgassing of the organic component can be effectively suppressed by a polymer/glass stack pressure-tight encapsulation, enabling PSCs to pass both the damp heat test and humidity freezing test.…”

Highly Efficient Tin Perovskite Solar Cells Based on a Triple Reactant Strategy

“…Tin perovskite solar cells are emerging as a promising thin-film photovoltaic technology due to the toxic-element-free character and superior optoelectronic properties, such as a desirable band gap with a high Shockley–Quisser limit efficiency (>33%) and excellent carrier mobility . Over the past few years, the power conversion efficiency (PCE) of tin perovskite solar cells increases rapidly from approximately 6% to over 14%. − Significant efforts have been made to improve efficiency, including composition manipulation, − dimensionality control, − and the decrease of oxidation, , as well as device structural engineering. − The use of a quasi-two-dimensional (quasi-2D) perovskite structure is an important approach to improve device performance since it can reduce oxidation and regulate film growth simultaneously …”