Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells
By Xiaodong Li, Wenxiao Zhang, Xuemin Guo, Chunyan Lu, Jiyao Wei, Junfeng Fang. Science, 2022
655 citations recorded by the source corpus.
A stable perovskite heterojunction was constructed for inverted solar cells through surface sulfidation of lead (Pb)–rich perovskite films. The formed lead-sulfur (Pb-S) bonds upshifted the Fermi level at the perovskite interface and induced an extra back-surface field for electron extraction. The resulting inverted devices exhibited a power conversion efficiency (PCE) >24% with a high open-circuit voltage of 1.19 volts, corresponding to a low voltage loss of 0.36 volts. The strong Pb-S bonds could stabilize perovskite heterojunctions and strengthen underlying perovskite structures that have a similar crystal lattice. Devices with surface sulfidation retained more than 90% of the initial PCE after aging at 85°C for 2200 hours or operating at the maximum power point under continuous illumination for 1000 hours at 55° ± 5°C. Description Inverted solar cells’ surface sulfidation Perovskite solar cells (PSCs) with high power conversion efficiency (PCE) and stability have been reported in regular n-i-p devices, but inverted p-i-n PSCs that could be easier to use in tandem solar cells usually have lower PCEs (22 to 23%) Li et al. sulfurized a lead-rich layer with hexamethyldisilathiane, and the lead-sulfur bonds shifted the Fermi level of perovskite-transporter layer interface to create an electric field that enhanced electron extraction. The inverted PSCs had PCEs >24%, and the strong lead-sulfur bonds helped to maintain >90% of this efficiency during illuminated operation for 1000 hours at 55°C and after dark aging at 85°C for 2200 hours. —PDS Surface sulfidation of perovskite film increases its stability and improves electron extraction through band bending.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/a6c833b60174f85873fe1330ba68c383259703c0
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Citations in the corpus
- Surface reaction for efficient and stable inverted perovskite solar cells (2022, background): “An ideal surface engineering approach for p–i–n PSCs should: (1) not negatively affect the bulk quality of the perovskite film; (2) not produce materials hindering charge transfer; (3) reduce the density of unwanted defects; and/or (4) have a surface region that creates a built-in electric field, en”