Printable CsPbI<sub>3</sub> Perovskite Solar Cells with PCE of 19% via an Additive Strategy.
basic_science · Level V
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- Record sourced from PubMed, PMID 32864773.
- Also identified by DOI 10.1002/adma.202001243.
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Abstract
All-inorganic CsPbI<sub>3</sub> holds promise for efficient tandem solar cells, but reported fabrication techniques are not transferrable to scalable manufacturing methods. Herein, printable CsPbI<sub>3</sub> solar cells are reported, in which the charge transporting layers and photoactive layer are deposited by fast blade-coating at a low temperature (≤100 °C) in ambient conditions. High-quality CsPbI<sub>3</sub> films are grown via introducing a low concentration of the multifunctional molecular additive Zn(C<sub>6</sub> F<sub>5</sub> )<sub>2</sub> , which reconciles the conflict between air-flow-assisted fast drying and low-quality film including energy misalignment and trap formation. Material analysis reveals a preferential accumulation of the additive close to the perovskite/SnO<sub>2</sub> interface and strong chemisorption on the perovskite surface, which leads to the formation of energy gradients and suppressed trap formation within the perovskite film, as well as a 150 meV improvement of the energetic alignment at the perovskite/SnO<sub>2</sub> interface. The combined benefits translate into significant enhancement of the power conversion efficiency to 19% for printable solar cells. The devices without encapsulation degrade only by ≈2% after 700 h in air conditions.