Surface State‐Mediated Charge Transfer of Cs<sub>2</sub>SnI<sub>6</sub> and Its Application in Dye‐Sensitized Solar Cells

Shin, HyeonOh; Byung-Man, Kim.; Jang, Taehyung; Kim, Kwang Min; Roh, Deok‐Ho; Nam, Jung Seung; Kim, Jeong Soo; Kim, Un‐Young; Lee, Byunghong; Pang, Yoonsoo; Kwon, Tae‐Hyuk

doi:10.1002/aenm.201803243

Cited by 39 publications

(35 citation statements)

References 42 publications

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“…25,26,27,28,32,34 Our work is in good agreement with those pointing to high bandgap in this range. 25,27,32,34 Regarding the optical bandgap, the photoluminescence (PL) of the thin films results in the emission peak ( Figure 5d) at 792 nm. Translated to energy, this value means 1.57 eV, which matches with the result obtained from the Tauc plot, with a relatively small Stokes shift.…”

Section: Resultssupporting

confidence: 91%

“…Nevertheless, this material itself constitutes a more air stable candidate than its nonoxidized counterpart . It has been previously used as a hole transport layer (HTL) in dye-sensitized solar cells, − and also as nanowires or quantum rods . Several synthesis methods have been employed for its preparation. ,, However, the optical properties of this material have not been broadly studied in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

López-Fraguas

Masi

Mora‐Seró

2019

ACS Appl. Energy Mater.

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Halide perovskites have experienced a huge development in the past years, but they still have two major challenges for their massive implantation: the long-term stability and the use of lead. One of the most obvious lead-free candidates to replace these perovskites is CsSnI 3 but, due to its poor environmental stability, it has been discarded for the fabrication of stable devices. Nevertheless, ambient degradation of CsSnI 3 and ulterior reconstruction produces relatively stable lead-free Cs 2 SnI 6 double perovskite with interesting optical properties that have not been deeply characterized previously. In this work, the potentiality of the optical properties of Cs 2 SnI 6 is studied and compared with the most common halide perovskite, CH 3 NH 3 PbI 3 (MAPbI 3). The Cs 2 SnI 6 films stayed in standard atmosphere during a week without showing any signs of degradation. They also demonstrated better reflective behavior than MAPbI 3 and higher absorption in the 650 nm and 730 nm spectral range, making this material interesting for the development of photodetectors in this region. This study demonstrates that Cs 2 SnI 6 is a promising material for photo-devices, as it highlights its main characteristics and optical parameters, giving an original view on the use of the double perovskite, but at the same time emphasizing the need to improve the electrical properties for the development of efficient optoelectronic devices.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

López-Fraguas

Masi

Mora‐Seró

2019

ACS Appl. Energy Mater.

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“…In the seek for the lead-free perovskite materials, Sn-based perovskites have been demonstrated to have a narrower optical bandgap than that of the Pb-based perovskites [26][27][28][29][30] , indicating their larger light absorption range. Especially, all-inorganic Cs 2 SnI 6 perovskite is more preferred material system in view of its good stability, superior conductivity, and appropriate energy band levels [31][32][33][34][35] .…”

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confidence: 99%

Single-atom Pt-I3 sites on all-inorganic Cs2SnI6 perovskite for efficient photocatalytic hydrogen production

et al. 2021

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Organic-inorganic lead halide perovskites are a new class of semiconductor materials with great potential in photocatalytic hydrogen production, however, their development is greatly plagued by their low photocatalytic activity, instability of organic component and lead toxicity in particular. Herein, we report an anti-dissolution environmentally friendly Cs2SnI6 perovskite anchored with a new class of atomically dispersed Pt-I3 species (PtSA/Cs2SnI6) for achieving the highly efficient photocatalytic hydrogen production in HI aqueous solution at room temperature. Particularly, we discover that Cs2SnI6 in PtSA/Cs2SnI6 has a greatly enhanced tolerance towards HI aqueous solution, which is very important for achieving excellent photocatalytic stability in perovskite-based HI splitting system. Remarkably, the PtSA/Cs2SnI6 catalyst shows a superb photocatalytic activity for hydrogen production with a record turnover frequency of 70.6 h−1per Pt, about 176.5 times greater than that of Pt nanoparticles supported Cs2SnI6 perovskite, along with superior cycling durability. Charge-carrier dynamics studies in combination with theory calculations reveal that the dramatically boosted photocatalytic performance on PtSA/Cs2SnI6 originates from both unique coordination structure and electronic property of Pt-I3 sites, and strong metal-support interaction effect that can not only greatly promote the charge separation and transfer, but also substantially reduce the energy barrier for hydrogen production. This work opens a new way for stimulating more research on perovskite composite materials for efficient hydrogen production.

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“…[ 92 ] Interestingly, a Cs 2 SnI 6 ‐based regenerator was developed for DSSCs to evaluate the capability of Cs 2 SnI 6 in regenerating oxidized organic dyes. [ 133 ] It was suggested that the highest occupied molecular orbital of the dyes has a strong influence on the performance of the Cs 2 SnI 6 ‐based regenerator. Furthermore, the performance of the Cs 2 SnI 6 ‐based regenerator was compared with a conventional liquid electrolyte.…”

Section: Applications Of Cs2sni6mentioning

confidence: 99%

Section: Applications Of Cs2sni6mentioning

confidence: 99%

Lead‐Free Cs₂SnI₆ Perovskites for Optoelectronic Applications: Recent Developments and Perspectives

et al. 2021

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Since the booming research on perovskite solar cells (PSCs), organic–inorganic hybrid halide perovskites have triggered widespread research attention. This is seen in the unprecedented improvement of the power conversion efficiency (PCE) from an initial 3.8% to a remarkable 25.5%. Despite the fascinating improvement in PCEs, the toxicity of the detrimental lead element is a major limiting factor that hampers the commercialization prospect of lead‐based materials. Extensive efforts have been dedicated to the progress of lead‐free, stable, and ecofriendly perovskite materials for green‐energy applications. Recently, double‐halide Cs2SnI6 perovskite emerged as a star material due to its favorable optoelectronic properties, stable nature, and environmental friendliness. Thus, an in‐time review to recapitulate the recent advances of Cs2SnI6 is critical to provide viable theoretical and experimental strategies for synergic optimization of perovskite films. Herein, the theoretical and experimental understandings of the properties of Cs2SnI6 are summarized and the different fabrication methodologies and their influences on the properties of Cs2SnI6 are discussed. The application potential of Cs2SnI6 is further reviewed and the limiting factors that influence the performance of Cs2SnI6 devices are highlighted. In the end, prospective research directions to improve the optoelectronic properties are presented for developing efficient Cs2SnI6 devices.

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Surface State‐Mediated Charge Transfer of Cs₂SnI₆ and Its Application in Dye‐Sensitized Solar Cells

Cited by 39 publications

References 42 publications

Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

Single-atom Pt-I3 sites on all-inorganic Cs2SnI6 perovskite for efficient photocatalytic hydrogen production

Lead‐Free Cs₂SnI₆ Perovskites for Optoelectronic Applications: Recent Developments and Perspectives

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Surface State‐Mediated Charge Transfer of Cs2SnI6 and Its Application in Dye‐Sensitized Solar Cells

Cited by 39 publications

References 42 publications

Optical Characterization of Lead-Free Cs2SnI6 Double Perovskite Fabricated from Degraded and Reconstructed CsSnI3 Films

Optical Characterization of Lead-Free Cs2SnI6 Double Perovskite Fabricated from Degraded and Reconstructed CsSnI3 Films

Single-atom Pt-I3 sites on all-inorganic Cs2SnI6 perovskite for efficient photocatalytic hydrogen production

Lead‐Free Cs2SnI6 Perovskites for Optoelectronic Applications: Recent Developments and Perspectives

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Product

Resources

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Surface State‐Mediated Charge Transfer of Cs₂SnI₆ and Its Application in Dye‐Sensitized Solar Cells

Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

Optical Characterization of Lead-Free Cs₂SnI₆ Double Perovskite Fabricated from Degraded and Reconstructed CsSnI₃ Films

Lead‐Free Cs₂SnI₆ Perovskites for Optoelectronic Applications: Recent Developments and Perspectives