Architecturing Lattice-Matched Bismuthene–SnO₂ Heterojunction for Effective Perovskite Solar Cells

Abstract

To explore the attractive structural and semiconductive properties of two-dimensional bismuthene, exquisite heterojunctions with less interfacial mismatch between bismuthene and SnO 2 nanoparticle are coincidentally architected by a low-temperature procedure, based on a unique self-adaptive attribute of the two-dimensional structure of bismuthene, in combination with the lattice-matching attribute of adjacent lattice-spacing between bismuthene and SnO 2 . When applied in perovskite solar cells as an electron transport layer, the bismuthene−SnO 2 composite layer turns smoother and more transparent and endows higher crystallinity to the upper perovskite layer. Depending on highly conductive bismuthene along with semiconductive bismuthene−SnO 2 heterojunctions, the energy band of the integral composite layer is upshifted and the interfacial resistance between the composite layer and the perovskite layer is reduced, effectively accelerating the electron extraction without declining the hole-blocking, in comparison with the pure SnO 2 layer. A higher statistical average power conversion efficiency of 18.75% is achieved, compared to the counterpart of 17.35%, and it also maintains a high stability of almost 80% of its initial efficiency even in an ∼5% relative humidity environment for more than 800 h, in contrast to its counterpart, which maintains just 50% efficiency retention.

Optimization of SnO2 electron transport layer for efficient planar perovskite solar cells with very low hysteresis

“…[53][54][55][56] Lithium (Li) has been introduced as promising dopant 5,36,[57][58][59][60][61] for improving the ETL/perovskite interface among others. [37][38][39][40] In case of mesoporous TiO 2 , it has been shown that a post-treatment with Lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) as the Li source can improve the electronic properties of TiO 2 , resulting in an enhanced electron mobility and a reduced electron trap density in TiO 2 . 5,36,61 At the same time charge extraction from and energetic alignment with the perovskite are improved, thereby improving the PCE and reducing J-V hysteresis of PSCs.…”

Architecture lattice‐matched cauliflower‐like CuO/ZnO p–n heterojunction toward efficient water splitting

“…[26][27][28][29][30] Furthermore, the lattice-matched heterogeneous interface of ZnO and CuO could consolidate the synergistic effects via decreasing the interfacial contact resistance, optimizing the interfacial transmission path and rebuilding active reaction sites. [31][32][33] However, those CuO/ZnO photocathodes are fabricated via a long, complex operation, being time-consuming with many steps, by which CuO is initially synthesized, followed by the modification of ZnO. More importantly, the multistep methods cannot easily constitute an effective contact at the boundary interface, but can lead to waste of vast sums of money and time.…”

Construction of a Bismuthene/CsPbBr3 Quantum Dot S-Scheme Heterojunction and Enhanced Photocatalytic CO2 Reduction

“…All elements of Bi, Cs, Pb, and Br may be observed, indicating the formation of Bismuthene/CsPbBr 3 QDs, which is consistent with the FTIR and TEM characterization in Figure a,c. The high-resolution of Bi 4f spectra of Bismuthene and Bismuthene/CsPbBr 3 QDs are shown in Figure a. , The main peaks of Bi 4f 5/2 and Bi 4f 7/2 are located at 161.86, 158.80, and 163.53, 158.12 eV for Bismuthene/CsPbBr 3 QDs and Bismuthene, respectively. The peaks of the oxidized Bismuthene (Bi x O y ) locate at 164.09, 159.60 and 165.31, 159.94 eV for Bismuthene/CsPbBr 3 QDs and Bismuthene, which are assigned to Bi x O y 4f 5/2 and Bi x O y 4f 7/2 , respectively.…”