Convenient preparation of CsSnI3 quantum dots, excellent stability, and the highest performance of lead-free inorganic perovskite solar cells so far

Perovskite quantum dots (PVQDs) have been demonstrated to be favorable materials for opto-electronic devices regardless of the generally required complicated preparation processes including solvent exchanges. Here, we report a novel convenient and efficient approach to produce CsSnI3 PVQDs through one-pot synthesis. Specifically, the produced PVQD solutions were clear and stable at room temperature after 90 days due to the antioxidant solvent additive (ASA) triphenyl phosphite (TPPi). Interestingly, the corresponding CsSnI3 PVQD-based solar cells achieved the maximum power conversion efficiency (PCE) of 5.03%, which is the highest performance for all-inorganic lead-free perovskite solar cells reported so far.