OPTICS EXPRESS
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2023
·Vol. 32
·期 1
·366-378
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IF 3.8
Feida Li,Kangning Liu,Jun Dai
Flexible perovskite solar cells (F-PSCs) prevail in the clean energy field for their light weight, easy fabrication and installation, but the power conversion efficiency of F-PSCs needs further improvement. In this work, we numerically simulate and experimentally demonstrate the effect of the perovskite trap defects density on the power conversion efficiency. The pseudo-halide KBF4 is employed as the additive to passivate the trap defects in the perovskite films. The high electrophilicity of BF4- group ensures its entering into perovskite lattice, optimizing crystallinity and improving the qualities of perovskite films, K+ ions can effectively passivate grain boundaries and inhibit halide anion migrations. After KBF4 passivation, trap defect density of the perovskite film was decreased from 8.0 × 1015cm−3 to 3.9 × 1015cm−3, and also the carrier lifetime increased from 108.52 ns to 234.72 ns. Consequently, the power conversion efficiency (PCE) of the F-PSCs devices increased from 13.99% to 16.04%.
研究领域:
材料科学
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清洁能源技术
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光电转换
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产品关联
DOI
PubMed
高影响因子
Photonics
·
2023
·Vol. 10
·期 10
·1113
·
IF 2.4
Junhu Cai,Xiaogang Chen,Wenyan Zhang,Longwen Yang,Zexi Lin,Wenxiao Zhao,Yun Ye,Sheng Xu,Tailiang Guo,Enguo Chen
Owing to their composition-tunable and narrow emissions and high photoluminescence quantum yield (PLQY), inorganic halide perovskite quantum dots (IPQDs) are a promising option for wide color gamut displays. However, their practical applications have been limited by their lattice structure instability and surface defect states. Herein, CsPbBr3:KBF4@SiO2with improved stability and optical properties is successfully synthesized with a two-step optimization of fluorine (F) anion doping and SiO2in situ coating. Compared with bromide (Br), higher electronegativity and a smaller radius of F lead to stronger binding energy with Pb2+. Also, F anions can occupy surface Br vacancies. Then, benefiting from the acidic environment provided by BF4−hydrolysis, tetraethyl orthosilicate (TEOS) can be more easily hydrolyzed on the CsPbBr3:KBF4surface to generate SiO2coating, thus further passivating lattice defects and improving environmental stability. Importantly, the PLQY of CsPbBr3:KBF4@SiO2achieves 85%, and the stability has been greatly improved compared with pure CsPbBr3. Finally, CsPbBr3:KBF4@SiO2/PDMS, CsPbI3/PDMS, and CsPbCl3/PDMS composites with narrow emissions are applied to replace traditional phosphors as color converters for direct-view light-emitting diode (LED) displays or liquid crystal display (LCD) backlights. The color gamut reaches 118.22% under the NTSC standard. Concerning the display field, it suggests likely applications in the future.Keywords:CsPbBr3;KBF4;SiO2;wide color gamut;liquid crystal displays;LED displays
研究领域:
材料科学
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光学工程
·
显示技术
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DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Qiaofeng Wu,Taotao Hu,Chang Liu,Yue Yu,Hongming Hou,Rui Liu,Meng Zhang,Hua Yu
As a difficult problem for state-of-the-art perovskite solar cells (PSCs), interfacial energy loss leads to undesirable photovoltaic performance of PSCs, especially the open-circuit voltage (VOC). Interfacial energy level modulation has been proven as an effective strategy to minimize the interfacial energy loss with boosted VOC. Herein, an efficient energy level modulation layer, potassium fluoroborate (KBF4), is applied onto the surface of a nickel oxide (NiOX) hole transport layer in planar inverted PSCs. The BF4– group has a strong electron binding energy and high electrophilicity, which affect the electronic structure of the NiOX surface significantly. Therefore, with the thin KBF4 band modulation layer, the work function (WF) of NiOX increases, and the energy difference between the Fermi level and valence band decreases. This brings about a reinforced build-in field in comparison with the control film without KBF4, leading to acceleration of hole extraction and suppression of charge recombination. Consequently, a maximum power conversion efficiency (PCE) of 19.84% with a large VOC of 1.13 V is achieved with superior stability. This work focuses on studying the energy level management of NiOX-based inverted perovskite solar cells and offering a feasible path to design well-matched energy levels in PSC systems.
研究领域:
材料科学
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能源技术
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光电领域
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2023
·
IF 3.9
Qingxiong Liu,Chuan Tang,Yiyang Wen,Tianyu Wang,Qian Wu,Chongjun He,Mingjun Xia
Nonlinear optical (NLO) crystal, simultaneously exhibits second-harmonic generation response and linear electric-optical (EO) susceptibility, is of great significance for optoelectronics due to its frequency extension technique and optical modulation effect. In this paper, the growth system of K 3 B 6 O 10 Br (KBB) crystal in the green-flux K 2 MoO 4 –KBF 4 was systematically investigated to get rid of the non-intrinsic absorption in the ultraviolet wavelength range, which is beneficial for high-power applications. Bulk KBB NLO crystals were successfully grown by the top-seeded solution growth method from different fluxes for comparison. Moreover, the electro-optical (EO) property of KBB crystal was explored, and the effective EO coefficient γ 22 along transverse modulation was determined to be 1.10 p.m./V.
研究领域:
材料科学
·
光学
·
电光
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DOI
高影响因子
危险品化学品经营许可证（带存储）