Researchers have developed a method to improve the stability and efficiency of inverted perovskite solar cells by using two different passivation molecules. The cells exhibited increased operating stability and reduced nonradiative recombination losses.
Compared with the n-i-p structure, inverted (p-i-n) perovskite solar cells (PSCs) promise increased operating stability, but these photovoltaic cells often exhibit lower power conversion efficiencies (PCEs) because of nonradiative recombination losses , particularly at the perovskite/Cinterface. We passivated surface defects and enabled reflection of minority carriers from the interface into the bulk using two types of functional molecules.
A sulfur-modified methylthio molecule provided chemical passivation, and a diammonium molecule repelled minority charge carriers and reduced contact-induced recombination. These cells had a certified quasi–steady-state power conversion efficiency and operated stably at 65°C for more than 2000 hours in ambient air
Inverted Perovskite Solar Cells Stability Efficiency Passivation Molecules Nonradiative Recombination Losses
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