Journal
SMALL METHODS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202300202
Keywords
low-lead perovskites; thermal stability; two-step fabrication; vacuum treatment
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In this study, a vacuum-drying strategy in the two-step method was employed to fabricate low-lead perovskite solar cells with an impressive efficiency of 19.67%. The vacuum treatment induced the formation of low crystalline Pb0.3Sn0.7I2 films containing less solvent, thereby facilitating FAI penetration and suppressing pinholes. Compared to the conventional one-step method, the two-step fabricated low-lead perovskite films with vacuum-drying treatment exhibited larger grain size, lower trap density, weaker recombination loss, resulting in better thermal stability and a record-high efficiency near 20%.
Lead-tin mixed perovskites are excellent photovoltaic materials that can be used in single- or multi-junction perovskite solar cells (PSCs). However, most high-performance Pb-Sn mixed PSCs reported to date are still Pb-dominant. It is highly demanding to develop environmentally friendly low-lead PSCs, but the poor film quality caused by the uncontrollable crystallization kinetics has been hindering the efficiency improvement of low-lead PSCs. Here, a vacuum-drying strategy in the two-step method to fabricate low-lead PSCs (FAPb(0.3)Sn(0.7)I(3)) with an impressive efficiency of 19.67% is employed. The vacuum treatment induces the formation of low crystalline Pb0.3Sn0.7I2 films containing less solvent, thus facilitating the subsequent FAI penetration and suppressing pinholes. Compared with the conventional one-step method, the two-step fabricated low-lead perovskite films with the vacuum-drying treatment exhibit a larger grain size, lower trap density, and weaker recombination loss, thus giving rise to a record-high efficiency near 20% with better thermal stability.
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