Stretchable Perovskite Solar Cells with Recoverable Performance.
Angew Chem Int Ed Engl
; 59(38): 16602-16608, 2020 Sep 14.
Article
en En
| MEDLINE
| ID: mdl-32472623
ABSTRACT
Perovskite solar cells (PSCs) are a promising photovoltaic technology for stretchable applications because of their flexible, light-weight, and low-cost characteristics. However, the fragility of crystals and poor crystallinity of perovskite on stretchable substrates results in performance loss. In fact, grain boundary defects are the "Achilles' heel" of optoelectronic and mechanical stability. We incorporate a self-healing polyurethane (s-PU) with dynamic oxime-carbamate bonds as a scaffold into the perovskite films, which simultaneously enhances crystallinity and passivates the grain boundary of the perovskite films. The stretchable PSCs with s-PU deliver a stabilized efficiency of 19.15 % with negligible hysteresis, which is comparable to the performance on rigid substrates. The PSCs can maintain over 90 % of their initial efficiency after 3000â
hours in air because of their self-encapsulating structure. Importantly, the self-healing function of the s-PU scaffold was verified inâ
situ. The s-PU can release mechanical stress and repair cracks at the grain boundary on multiple levels. The devices recover 88 % of their original efficiency after 1000â
cycles at 20 % stretch. We believe that this ingenious growth strategy for crystalline semiconductors will facilitate development of flexible and stretchable electronics.
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Banco de datos:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Año:
2020
Tipo del documento:
Article
País de afiliación:
China