Tautomeric Passivation Strategy-Assisted Photostable Perovskite Solar Modules

Abstract

Defects weaken the stability of perovskite solar modules (PSMs) and aggravate the photodegradation process under continuous illumination (especially, UV light), limiting the competitiveness and commercial development of perovskite photovoltaics. Herein, we propose a tautomeric passivation strategy toward molecular isomerism passivation, 2,3-Bis(2,4,5-trimethyl-3-thienyl) maleimide (DAE), to assist defect passivation for photostable PSMs with sustainable UV protection. The tautomeric DAE molecule in the perovskite film after UV irradiation presents high charge density difference values (−0.182e for −C�O−Pb; 0.015e for N−H•••I − ) and efficiently improves the defect formation energy, preventing perovskite UV degradation through the free closed and open rings of the DAE molecule in the PSM. The DAE PSCs exhibit champion efficiencies up to 24.12% (small area: 0.08 cm 2 ) and 18.47% (module area: 25 cm 2 ) as well as long-term UV photostability, continuously charging a mobile phone through a DAE-PSM even on a cloudy day.

Improving Ultraviolet Stability of Perovskite Solar Cells via Singlet Fission Down‐Conversion†

“…[ 7‐9 ] Currently, the major barrier which limits the commercialization of PVSCs is the poor stability issue owing to multiple internal and external degradation processes caused by moisture, oxygen, heat and ultraviolet (UV) radiation. [ 10‐14 ] To address abovementioned issues, there are proposed strategies for improving device stability under practical application, containing encapsulation, dopants engineering, composition engineering, interfacial engineering, etc . [ 15‐18 ] The moisture and oxygen induced instability can be eliminated by encapsulating PVSCs in a dry and oxygen‐free operating environment and the thermal stability can be enhanced by constructing 2D/3D stacking structure.…”

Anti-corrosion strategy to improve the stability of perovskite solar cells

“…Therefore, there is an urgent need to find new passivation methods to match the defects generated during device operation. In 2022, Song et al 105 proposed a tautomeric passivation approach for molecular isomerism passivation to assist defect passivation for light stable perovskite devices with sustainable ultraviolet (UV) protection. 2,3-Bis(2,4,5-trimethyl-3-thienyl) maleimide (DAE) helps passivate defects and enhances the photostability of devices, especially sustainable UV protection for devices (Fig.…”

“…Compared with MAPbI 3 , PS-MAPbI 3 has a lower number of Reproduced with permission. 105 Copyright 2022 The Royal Society of Chemistry. (c) Performance healing of the aged devices by heating treatment.…”

Enhancing Efficiency and Stability of Perovskite Solar Cells via Photosensitive Molecule-Assisted Defect Passivation

“…To reduce the adverse impact of UV light and prolong the lifetime of perovskite solar cells under sunlight illumination, several efforts have been reported to restrict perovskite degradation. − For instance, Song et al proposed a “sunscreen” strategy that used a tautomeric molecule to realize enhanced UV photostability; 2-hydroxy-4-methoxy­benzophenone was utilized to restrain the degradation of perovskites by the UV tautomeric transition. Consequently, corresponding PSCs exhibited a champion efficiency of up to 23.09% with excellent UV stability .…”