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Piezo-Phototronic Effect Enhanced Efficient Flexible Perovskite Solar Cells.
ACS Nano 2019 March 16
Tremendous work has been made recently to improve the power conversion efficiencies (PCEs) of the perovskite solar cells (PSCs); the best reported value is now over 23%. However, further improving the PCEs of PSCs is challenged by material's properties, device stability and packaging technologies. Here, we report a new approach to raise the PCEs of flexible PSCs via introducing the piezo-phototronic effect in the PSCs via growing an array of ZnO nanowires on flexible plastic substrates, which act as the electron-transport layer for PSC. Benefited from piezo-phototronic effect, the absolute PCE was improved from 9.3% to 12.8% for flexible perovskite solar cells under a static mechanical strain of 1.88 %, with a ~40% enhancement but no change in the components of materials and device structure. A corresponding working model was proposed to elucidate the strategy to boost the performance of the PSCs. These findings present a general approach to improve PCEs of the flexible PSCs without changing their fundamental materials.
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