Speaker Biography

Ubaid Khan

Beijing Institute of Technology, China

Title: Perovskite Solar Cells with Cesium doping

Biography:

Abstract:

Perovskite thin film solar cells have experienced astonishing efficiency improvements from 2.2% to above 22% in recent years. The high efficiency, ease and low embodied energy fabrication and the band gap tunability make it promising as the next generation of low cost photovoltaic devices and in the application of tandem solar cells with even higher efficiencies. Here, an effective additive CsI is incorporated into the CsPbI2Br perovskite solar cell. As a result CsI particles penetrate into the holes of the CsPbI2Br lattice during the growth process leading to suppressed nucleation and led to the extraction of the high efficiency charge and suppressed the recombination of the carrier. Consequently, the sample cells showed a relatively high PCE of 15.54% and an excellent FF of 79.37%. More importantly, the Perovskite solar cells unencapsulated with the layers of the CSI interface showed remarkable stability by retaining 90% of the initial power conversion efficiency with thermal treatment at 80 ° C for 135 minutes in ambient air, 75% of the power conversion efficiency initial under illumination continues for 90 minutes in the ambient air and 89% of the initial power conversion efficiency after being placed in the nitrogen glove-box for 45 days.