Multifunctional Molecule Engineered SnO₂ for Perovskite Solar Cells with High Efficiency and Reduced Lead Leakage

Abstract

Owing to the low exciton dissociation energy, long charge carrier lifetime, high absorption coefficient, and the ease of large-area fabrication of hybrid perovskite thin films, perovskite solar cells (PSCs) have attracted extensive attention during the past decade. [1][2][3][4][5][6][7][8][9][10][11] To date, the power conversion efficiency (PCE) of the stateof-the-art perovskite solar devices has been boosted from 3.8% [12] to a certified 25.5%. [13] Except for the composition (the types of cations and anions) and the quality of the perovskite absorber, [7,[14][15][16][17][18][19] the photoelectrical properties of the carrier transport layers (CTLs) are another important factor that determines the PCE and longterm stability of the PSCs. The optical and electrical properties of the CTLs not only affect the fill factor (FF) of the PSCs, but also the short-circuit current density ( J SC ). [6,8] In addition, the atomistic details of the surface of the CTLs also bring the

CsPbCl3‐Cluster‐Widened Bandgap and Inhibited Phase Segregation in a Wide‐Bandgap Perovskite and its Application to NiOx‐Based Perovskite/Silicon Tandem Solar Cells

“…A relatively stable PCE of 25.0% at MPP was observed after 1200 s, which corresponds to one of the highest efficiencies reported for an n-i-p-type perovskite/silicon tandem device based on spiro-OMeTAD as HTL. [40,41] We also investigated the impact of the 3:3 and 3:5 dopant ratios on device stability. Figure 4e shows the stabilities of unencapsulated devices under continuous irradiation with light and in air (at 25 °C with a humidity of about 20%).…”

“…A relatively stable PCE of 25.0% at MPP was observed after 1200 s, which corresponds to one of the highest efficiencies reported for an n–i–p ‐ type perovskite/silicon tandem device based on spiro‐OMeTAD as HTL. [ 40,41 ]…”

Managing Lead Leakage in Efficient Perovskite Solar Cells with Phosphate Interlayers

“…Na 3 PO 4 can effectively passivate the buried interface of perovskite film, leading to more uniform and homogeneous crystals with less residual PbI 2 and large crystal size in the final films. [ 31,32 ] It has also been reported that a moderate amount of excessive PbI 2 will passivate the grain boundaries, [ 33 ] while large amount of PbI 2 would greatly reduce the stability of the device. [ 34 ] Here in the case of SnO 2 :Na 3 PO 4 ‐based perovskite film has small amount of PbI 2 , which is better for grain boundary passivation than the pristine SnO 2 ‐based perovskite film with large amount of PbI 2 .…”

Sustainable Pb Management in Perovskite Solar Cells toward Eco‐Friendly Development

“…Reproduced with permission. [ 106 ] Copyright 2021, Wiley‐VCH. f) The schematic of mechanisms of the perovskite growth on SnO 2 and ATMP optimized SnO 2 .…”

“…Reproduced with permission. [ 106 ] Copyright 2021, Wiley‐VCH. h) Schematic diagram of Pb detection on the surface of ETLs after different washing times.…”