Robust Tin-Based Perovskite Solar Cells with Hybrid Organic Cations to Attain Efficiency Approaching 10.
basic_science · Level V
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- Record sourced from PubMed, PMID 30411826.
- Also identified by DOI 10.1002/adma.201804835.
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Abstract
The stability of a tin-based perovskite solar cell is a major challenge. Here, hybrid tin-based perovskite solar cells in a new series that incorporate a nonpolar organic cation, guanidinium (GA<sup>+</sup> ), in varied proportions into the formamidinium (FA<sup>+</sup> ) tin triiodide perovskite (FASnI<sub>3</sub> ) crystal structure in the presence of 1% ethylenediammonium diiodide (EDAI<sub>2</sub> ) as an additive, are reported. The device performance is optimized at a precursor ratio (GAI:FAI) of 20:80 to attain a power conversion efficiency (PCE) of 8.5% when prepared freshly; the efficiencies continuously increase to attain a record PCE of 9.6% after storage in a glove-box environment for 2000 h. The hybrid perovskite works stably under continuous 1 sun illumination for 1 h and storage in air for 6 days without encapsulation. Such a tin-based perovskite passes all harsh standard tests, and the efficiency of a fresh device, 8.3%, is certified. The great performance and stability of the device reported herein attains a new milestone for lead-free perovskite solar cells on a path toward commercial development.