Abstract
The rapid development of flexible perovskite solar cells (FPSCs) has attracted more and more attention. The application of FPSCs is largely in thrall to the fragility of perovskite crystals and quality of perovskite films caused by the inherent nature and uncertain grain size of perovskite. A polymer additive as an efficient strategy is utilized to restrict the fragility and improve the durability of FPSCs. In this work, we use polycaprolactone (PCL) as a polymer additive to achieve the grain boundary regulation (improving the grain size) and the desirable mechanical strength of FPSCs. A champion device based on glass/indium tin oxide (ITO) achieves high photoelectric conversion efficiency (PCE) (14.49%), which is ∼37.7% higher than that of the pristine film (10.52%). While the efficiency of FPSCs also retains 9.11%, which is 90% of the initial PCE (10.12%) after 300 bending cycles. Importantly, the PCL as a polymer additive shows great potential for future applications in wearable electronics.
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