Intermediate Phase‐Free Process for Methylammonium Lead Iodide Thin Film for High‐Efficiency Perovskite Solar Cells
Open Access
- 17 September 2021
- journal article
- research article
- Published by Wiley in Advanced Science
- Vol. 8 (21), 2102492
- https://doi.org/10.1002/advs.202102492
Abstract
Solvent engineering by Lewis-base solvent and anti-solvent is well known for forming uniform and stable perovskite thin films. The perovskite phase crystallizes from an intermediate Lewis-adduct upon annealing-induced crystallization. Herein, it is explored the effects of trimethyl phosphate (TMP), as a novel aprotic Lewis-base solvent with a low donor number for the perovskite film formation and photovoltaic characteristics of perovskite solar cells (PSCs). As compared to dimethylsulfoxide (DMSO) or dimethylformamide (DMF), the usage of TMP directly crystallizes the perovskite phase, i.e., reduces the intermediate phase to a negligible degree, right after the spin-coating, owing to the high miscibility of TMP with the anti-solvent and weak bonding in the Lewis adduct. Interestingly, the PSCs based on methylammonium lead iodide (MAPbI3) derived from TMP/DMF-mixed solvent exhibit a higher average power conversion efficiency of 19.68% (the best: 20.02%) with a smaller hysteresis in the current-voltage curve, compared to the PSCs that are fabricated using DMSO/DMF-mixed (19.14%) or DMF-only (18.55%) solvents. The superior photovoltaic properties are attributed to the lower defect density of the TMP/DMF-derived perovskite film. The results indicate that a high-performance PSC can be achieved by combining a weak Lewis base with a well-established solvent engineering process.Funding Information
- National Research Foundation of Korea (NRF‐2019R1A2C1084010, 2019M3D1A2104108, 2020R1A2C1102718, 2020R1A6A3A13073172)
- Korea Institute of Energy Technology Evaluation and Planning
This publication has 56 references indexed in Scilit:
- Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystalsScience, 2015
- Growth control of compact CH3NH3PbI3 thin films via enhanced solid-state precursor reaction for efficient planar perovskite solar cellsJournal of Materials Chemistry A, 2015
- Origin and elimination of photocurrent hysteresis by fullerene passivation in CH3NH3PbI3 planar heterojunction solar cellsNature Communications, 2014
- Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cellsNature Materials, 2014
- Additive Enhanced Crystallization of Solution‐Processed Perovskite for Highly Efficient Planar‐Heterojunction Solar CellsAdvanced Materials, 2014
- Interaction of organophosphorous compounds with TiO2 and WO3 surfaces probed by vibrational spectroscopySensors and Actuators B: Chemical, 2001
- Conformational behaviour of trimethyl phosphate studied by infrared spectroscopyJournal of Molecular Structure, 1996
- A Model for Boundary Diffusion Controlled Creep in Polycrystalline MaterialsJournal of Applied Physics, 1963
- The mechanism of densification during sintering of metallic particlesActa Metallurgica, 1956
- Acids and basesJournal of the Franklin Institute, 1938