APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Xianhua Tan,Xingyue Liu,Zhiyong Liu,Bo Sun,Junjie Li,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
CsPbIBr 2 perovskite exhibits the most balanced bandgap and durability features among all the inorganic perovskites, showing great potential in the photoelectric field. Nevertheless, the poor film quality of the traditionally spin-coated CsPbIBr 2 restricts the further improvement of the device performance. Here, we develop a novel lithium (Li) doping strategy to promote the optical, morphological and electronic properties of the solution-processed CsPbIBr 2 perovskites. Upon incorporating Li + ions into CsPbIBr 2 lattice, highly crystallized and well-oriented CsPbIBr 2 crystals are obtained. The as-prepared Li-doped CsPbIBr 2 exhibits a higher film coverage over the substrate with larger grains and less grain boundaries compared to the none-doped counterparts. The trap-state densities in the CsPbIBr 2 film are also effectively alleviated while the carrier lifetimes are elongated by Li doping, contributing to a lower energy loss and a higher charge collection efficiency. The optimized Li-doped perovskite solar cells (PSCs) demonstrate an excellent champion power conversion efficiency (PCE) of 9.25%, much higher than that of the none-doped devices (7.41%). Furthermore, the unencapsulated devices present a superior air and thermal stability under the protection of the hydrophobic CuPc layer and carbon electrode. Our work provides a new opportunity to fabricate cost-effective and highly efficient CsPbIBr 2 PSCs in a facile way.
研究领域:
材料科学
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能源技术
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Yingshen Lu,Danmin He,Xiang Yuan,Quanhe Yan,Xin Shu,Ziting Hu,Zifa Zhang,Zhuoyan Liu,Zuimin Jiang,Run Xu,Wenzhen Wang,Zhongquan Ma,Teng Chen,Haitao Xu,Fei Xu,Feng Hong,Hongwei Song
The realization of large-area high-quality perovskite thick films under an atmospheric environment without humidity control is confronting an urgent challenge for the applications in X-ray detection and imaging. A spray-coating method with air as the gas carrier is employed to achieve large-area perovskite thick films for X-ray flat-panel detection applications. To further improve the quality of the thick films, the 10 µm-thick CsPbIBr 2 films with (100)-preferred orientation, low trap density (7.1 × 10 12 cm −3 ) and high resistivity corresponding to low dark current (3.2 × 10 −9 A) are prepared via dual-additive-assisted (NH 4 SCN and L-α-phosphatidylcholine (LP)) solution strategy under atmospheric environment with relative humidity of 60% (60% RH). Thus, the metal-semiconductor-metal-structured (Au/CsPbIBr 2 /Au) transverse X-ray detection device under 40 KeV X-ray irradiation possesses a high sensitivity up to 1420 µC Gy air −1 cm −2 under a weak electric field of 18 V mm −1 and a low dose rate of 3.3 µGy air s −1 that is lower than a dose rate of ≈5.5 µGy air s −1 required for routine medical diagnosis. Strikingly, the unencapsulated device maintains 80% (1120 µC Gy air −1 cm −2 ) of the original sensitivity after 1000 h under the atmospheric environment with 45–55% RH. These results pave the way for the practical applications of perovskite thick films in X-ray medical detection and imaging.
研究领域:
材料科学
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医学成像
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半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
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IF 3.9
Cuiping Xu,Xingming Yang,Xiaofan Sun,Wenchao Tang,Peiqi Ji,Junjie Jiang,Ziyi Xu,Hong-Ling Cai,X.S. Wu
In the present, we investigate the light-induced phase instability and the recovery in light-free for CsPbIBr 2 film. Both 585 nm and 695 nm photoluminescence (PL) peaks are detected by illuminating films. Results show that the appearance and the intensity of 585 nm and 695 nm PL peaks are affected by the wavelength, remaining time, and intensity of the illuminating light. Under short time illumination, the 695 nm PL peak may disappear after staying light-free, with light–dark reversible behavior. Under long time illumination, the 695 nm PL peak still exist in light-free and become irreversible behavior, which is caused by the formation of I-rich and Br-rich small grains, destroyed the homogeneous phase structure, and formed new steady states. X-ray diffraction analysis and the first principle calculations proved the mechanism of light-induced phase separation. We argue that CsPbIBr 2 -based solar cells are difficult to be applied before inhibiting the phase separation of CsPbIBr 2 .
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Xingyue Liu,Junjie Li,Zhiyong Liu,Xianhua Tan,Bo Sun,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
CsPbIBr 2 perovskite , as a promising light harvester, possesses the most balanced bandgap and stability characters among all-inorganic perovskite materials. However, the poor quality of the traditionally one-step solution-processed CsPbIBr 2 film always leads to a severe recombination loss and thus a low output potential difference ( V oc ). Herein, we demonstrate a novel vapor-assisted deposition strategy to construct high-quality CsPbIBr 2 films for the first time, in which the crystallization kinetics of the CsPbIBr 2 is more easily controllable than that of the one-step spin-coated one. The PbBr 2 film acting as the template in the CsPbIBr 2 crystal growth is firstly prepared via an antisolvent-washing technique and CsI is then vacuum evaporated onto the PbBr 2 layer. By precisely tuning the thickness of the CsI film, highly phase-pure and crystallized CsPbIBr 2 crystals are successfully obtained. The optimized CsPbIBr 2 film also exhibits a homogeneous morphology and full coverage over the substrate with large grain sizes up to microscale and ultrahigh light absorption capability. The corresponding carbon-based CsPbIBr 2 solar cells achieve a champion power conversion efficiency of 8.76% with a superior V oc of 1.289 V. The large-area (1 cm 2 ) devices also deliver an efficiency of 6.78% with an impressive V oc of 1.336 V. Moreover, under the protection of the highly hydrophobic and chemically stable CuPc layer and carbon counter electrode, the unencapsulated devices present excellent moisture and thermal stabilities. Our work provides a new approach for the preparation of cost-effective, highly efficient and robust CsPbIBr 2 photovoltaics.
研究领域:
材料科学
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能源科学
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Li Gong,Jun-Sen Zhang,Cheng Wang,Hao Fu,Yang-Fan Lu,Jian-Lin Chen,Jin-Cheng Fan,Zi-Sheng Chao
In this paper, the ion substitution mechanism of CsPbIBr2 films prepared by a drop-coating method is studied. CsI/CsBr methanol solution is drop-coated on a CsPbIBr2 precursor film to prepare the CsPbIBr2 perovskite film. After drop-coating, it is found that the color of the perovskite film changes with CsI/CsBr methanol solution drop-coated on the perovskite precursor film. When CsBr methanol solution is drop-coated on a CsPbIBr2 precursor film, the color of the obtained CsPbIBr2 film is orange. The color of the obtained CsPbIBr2 film is brown while CsI methanol solution is drop-coated on a CsPbIBr2 precursor film. Then, the hole-free, carbon-based CsPbIBr2 perovskite solar cells (FTO/ZnO/CsPbIBr2/C) are fabricated. For the solar cells fabricated by drop-coating with 30 μL of CsBr, without methanol solution, with 10 μL of CsI, with 50 μL of CsI, and with 90 μL of CsI, the power conversion efficiency (PCE) values are 2.98, 3.99, 6.04, 7.60, and 8.42%, respectively. The short-circuit current density (JSC) also increases with the changing of drop-coating solution. Therefore, we suppose that perhaps there is an ion substitution during the preparation of the CsPbIBr2 films. The ion substitution supposition is verified by the results of X-ray diffraction, ultraviolet–visible spectra, X-ray photoelectron spectroscopy, and secondary ion mass spectroscopy. Specifically, the I element is replaced by the Br element while drop-coating CsBr methanol solution. The Br element is substituted by the I element by drop-coating CsI methanol solution. Also, it is verified that the ion substitution occurs in the entire perovskite film.
研究领域:
材料科学
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化学
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物理学
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太阳能
✓ 已验证
DOI
高影响因子
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