Zn2+ ion doping for structural modulation of lead-free Sn-based perovskite solar cells
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- Zn2+ ion doping for structural modulation of lead-free Sn-based perovskite solar cells
- Jang, Hyungsu; Lim, Hyeong Yong; Park, Chan Beom; Seo, Jongdeuk; Son, Jung Geon; Song, Taehee; Lee, Jaehwi; Shin, Yun Seop; Roe, Jina; Kwak, Sang Kyu; Kim, Dong Suk; Kim, Jin Young
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY A, v.11, no.20, pp.10605 - 10611
- Sn-based perovskites have intrinsic defects, such as Sn vacancies, oxidised components (Sn4+), and local lattice strain in the perovskite crystalline structure. In this study, Zn metal powder (Zn-0) was introduced to reduce Sn oxidation in the solution step based on the redox potential difference. Additionally, Zn2+ was introduced in the perovskite precursor, which decreased the intrinsic defects and lattice strain of the perovskite films. The diffusion length, particularly that of the hole, increased with a reduction in the lattice strain, and Zn doping led to interfacial energy-level alignment of the perovskite and hole-transporting layers. The reduced lattice strain decreased the defect density and charge carrier recombination of perovskite devices. The power conversion efficiency of the Zn-doped Sn-based perovskite solar cell was improved to 11.39% compared to the 8.56% of the reference device.
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