How antisolvent miscibility affects perovskite film wrinkling and photovoltaic properties.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33692346.
- Also identified by DOI 10.1038/s41467-021-21803-2 and PMC identifier 7946869.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Charge carriers' density, their lifetime, mobility, and the existence of trap states are strongly affected by the microscopic morphologies of perovskite films, and have a direct influence on the photovoltaic performance. Here, we report on micro-wrinkled perovskite layers to enhance photocarrier transport performances. By utilizing temperature-dependent miscibility of dimethyl sulfoxide with diethyl ether, the geometry of the microscopic wrinkles of the perovskite films are controlled. Wrinkling is pronounced as temperature of diethyl ether (T<sub>DE</sub>) decreases due to the compressive stress relaxation of the thin rigid film-capped viscoelastic layer. Time-correlated single-photon counting reveals longer carrier lifetime at the hill sites than at the valley sites. The wrinkled morphology formed at T<sub>DE</sub> = 5 °C shows higher power conversion efficiency (PCE) and better stability than the flat one formed at T<sub>DE</sub> = 30 °C. Interfacial and additive engineering improve further PCE to 23.02%. This study provides important insight into correlation between lattice strain and carrier properties in perovskite photovoltaics.