Roles of Organic Molecules in Inorganic CsPbX₃ Perovskite Solar Cells

Abstract

solution processes and have been proved to have similar optoelectronic properties with their organic counterparts. [24][25][26] So far, CsPbX 3 perovskites have been widely studied as alternative light absorbers in PSCs and considerable efforts are being made to improve device performance. [27][28][29][30][31][32][33][34] Among these efforts, organic molecular engineering in CsPbX 3 perovskites are the most straightforward method to improve device stability and PCE. [31,32] Since CsPbX 3 PSCs were first reported in 2015, great progress has been made on organic molecular engineering and over 19% PCE has been achieved. [35][36][37][38][39] In this review, we systematically reviewed and discussed the current development of organic molecular engineering in inorganic CsPbX 3 PSCs. First, structure evolution induced by organic molecular engineering was demonstrated. Then, the progresses on the inorganic CsPbX 3 PSCs will be reviewed and discussed in detail according to different molecule function (alloying in perovskite structures, as sacrificial agents, forming 2D structures, and modifying surfaces and interfaces). Finally, the current issues of molecular engineering will be pointed out and future directions will be highlighted.

Organic Matrix Assisted Low‐temperature Crystallization of Black Phase Inorganic Perovskites

“…[52,54] One major approach for tailoring the bulk all-inorganic perovskite thin film is to alter the crystallization route by introducing an organic or inorganic matrix, with the former including the incorporation of organic ions,p olymers,a nd solvent molecules. [41,42,55] Currently,the most commonly used engineering method based on solution chemistry [56][57][58] to obtain thin films of black CsPbI 3 at lower temperatures is by spin coating the precursor solution on as ubstrate,d uring which excess precursor solution will be removed, solvent will be simultaneously evaporated, and asolid perovskite film will form. As ubsequent thermal annealing process is always necessary to complete the crystallization.…”

Mn-derived Cs4PbX6 nanocrystals with stable and tunable wide luminescence for white light-emitting diodes

“…7–10 These characteristics afford metal halide perovskites NCs broad applications in light-emitting diodes (LEDs), solar cells, photodetectors, lasers and biological imaging. 11–20 However, three-dimensional (3D) perovskites have the characteristics of ionic crystals wherein wet and hot conditions lead to phase transition and decomposition of the NCs, which greatly limit their applications in optoelectronics. Therefore, researchers have focused on the development of low-dimensional perovskite derivatives.…”

Inhibiting octahedral tilting for stable CsPbI2Br solar cells

“…Besides, water can intensify the distortion of the corner‐sharing octahedral framework and accelerate the phase transition. Many strategies have been reported to improve the phase stability of inorganic perovskites, such as making perovskite quantum dots, B‐ or X‐site doping, introducing additives (e.g., organic molecules, polymers, salts, etc 5–9 10–12 .…”

“…Many strategies have been reported to improve the phase stability of inorganic perovskites, such as making perovskite quantum dots, B-or X-site doping, introducing additives (e.g., organic molecules, polymers, salts, etc. [5][6][7][8][9] ), and surface passivation by using organic cations. [10][11][12] Recently, Hong et al partially substituted Cs + by Rb + cations to obtain stable black phase under ambient conditions.…”