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Summary: After the rapid development of single-junction perovskite solar cells and organic solar cells, improving their power conversion efficiencies has become increasingly difficult. Tandem solar cells are gaining more attention due to their higher theoretical efficiency compared to single-junction solar cells. While good device performance has been achieved for perovskite/silicon and perovskite/perovskite tandem solar cells, very few studies have been done on 4-terminal inorganic perovskite/organic tandem solar cells. This work successfully fabricates 4-terminal inorganic perovskite/organic tandem solar cells using semi-transparent inorganic perovskite solar cells and organic solar cells, achieving higher efficiency than reported 2-terminal and 4-terminal inorganic perovskite/organic tandem solar cells.
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Summary: Controlling the crystallinity and surface morphology of perovskite layers is crucial for achieving high-efficiency perovskite solar cells. By adding alkylammonium chlorides (RACl) to a-formamidinium lead iodide (FAPbI(3)), the crystallization process and surface morphology of the perovskite thin films can be controlled. The resulting perovskite thin layers facilitate the fabrication of perovskite solar cells with a high power-conversion efficiency of 26.08%.
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Wei Chen et al.
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Changlei Wang et al.
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Chemistry, Multidisciplinary
Yuanjia Ding et al.
Summary: Among inorganic perovskites, CsPbI2Br shows great potential for single-junction perovskite solar cells (PSCs) and perovskite/organic tandem solar cells (TSCs) due to its intrinsic thermal stability, suitable bandgap, and superior phase-stability. This study demonstrates that using PTQ10 as a hole transport layer (HTL) for PSCs and an inter-connecting layer (ICL) for TSCs can significantly improve the power conversion efficiencies (PCEs) of CsPbI2Br-based devices. The PTQ10 HTL exhibits better energy level matching with CsPbI2Br and can passivate the perovskite surface, leading to enhanced performance in both PSCs and TSCs.
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Jingjing Tian et al.
Summary: CsPbI2Br perovskite solar cells show potential as a top cell for tandem applications, but the open-circuit voltage (V-OC) reported so far is usually below the detailed balance (DB) limit for single-junction PSCs. By adding lead acetate to the CsPbI2Br precursor, losses due to nonradiative recombination can be significantly reduced, leading to improved power conversion efficiency and higher V-OC values.
ACS ENERGY LETTERS
(2022)
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Summary: This study reports a pure-iodide wide-band-gap perovskite top cell that is almost free from halide segregation. Cs and dimethylammonium cations were simultaneously incorporated into the A-site of the perovskite to increase the band gap while maintaining the tolerance factor. However, the incorporation of dual cations resulted in the formation of orthorhombic and hexagonal phases instead of the pure perovskite phase.
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Zuxiong Xu et al.
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(2021)
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Lihua Zhu et al.
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Shangshang Chen et al.
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Yuanchuang Wu et al.
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