Synergic Interface Optimization with Green Solvent Engineering in Mixed Perovskite Solar Cells

Abstract

Organic–inorganic hybrid halide perovskite solar cells (PSCs) have recently drawn enormous attentions due to their impressive performance (>22%) and low temperature solution processability (<150 °C). Current solution process involves application of a large amount of toxic solvents, such as chlorobenzene, which is heavily employed in both the perovskite layer and the hole transport layer (HTL) deposition. Herein, this study employs green solvent of ethyl acetate for engineering efficient perovskite and HTL layers, which enables a synergic interface (perovskite/HTL) optimization. A champion efficiency of 19.43% is obtained for small cells (0.16 cm2 with mask) and over 14% for large size modules (5 × 5 cm2). The PSCs prepared from the green solvent engineering demonstrate superior performance on both efficiency and stability over their chlorobenzene counterparts. These enhancements are ascribed to the in situ inhibition on carrier recombination induced by interfacial defects during the solution processing, which enables about 2/3 reduction of calculated recombination rate. Thus, the green solvent route shows the great potential toward environmental‐friendly manufacturing.

High‐Quality Cs2AgBiBr6 Double Perovskite Film for Lead‐Free Inverted Planar Heterojunction Solar Cells with 2.2 % Efficiency

“…It is found that these solvents can help improving the quality of the Cs 2 AgBiBr 6 film due to the fast crystallization induced by anti-solvent, [43] but only IPA forms the neat and smooth film without holes ( Figure S3, S4). [45] But for all inorganic compound Cs 2 AgBiBr 6 , IPA could be suitable as anti-solvent. [44] It is found that alcohol can dissolve organic components, such as methylamine iodide and formamidine iodide, leading to decomposition of film with much rougher surface.…”

Enhanced Crystallinity of Low‐Temperature Solution‐Processed SnO2 for Highly Reproducible Planar Perovskite Solar Cells

“…However,t he lowtemperature process normally does not produce ah ighly crystalline metal oxide. [15][16][17] For example, MgO has been deposited on the surface of the SnO 2 to passivate the defects. High-temperature annealing normally improves the crystallinity of metal oxides;however,SnO 2 ETLs cannot be sintered at temperatures above 180 8Ca sp inholes can form in the SnO 2 thin films, resultingi napoor performance of the PSCs.…”

Anti-Solvent Crystallization Strategies for Highly Efficient Perovskite Solar Cells

“…Devices fabricated using the above films, exhibited record PCEs of 19.4%. Again, we should also emphasize the fact that all anti-solvents were dripped in an exactly similar manner [66]. The viability of EA as an anti-solvent was already confirmed by others [67][68][69].…”