RSC Advances
·
2018
·Vol. 8
·期 1
·390-395
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IF 2.936
Xianwei Fu,Shilong Jiao,Ning Dong,Gang Lian,Tianyu Zhao,Song Lv,Qilong Wang,Deliang Cui
A room-temperature NO2 gas sensor with excellent performances is fabricated using an MAPbI3 (MA = CH3NH3+) thin film. It presents a high response even under extremely low NO2 concentrations. Its average response and recovery times are only ∼5 s and ∼25 s at room temperature, respectively, exhibiting its quick-responsive character. In addition, the MAPbI3-based NO2 sensor exhibits good selectivity. Interestingly, the sensitivity of the MAPbI3-based NO2 sensor is strikingly improved under high-pressure gas conditions. This phenomenon can be used for the online monitoring of chemical reaction processes and in situ detection of trace-level gas impurities under high-pressure conditions. Furthermore, based on theoretical calculations, a simple model is proposed to illustrate the corresponding gas-sensing mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Shijie Du,Xicai Lai
CH₃NH₃PbI₃ (MAPbI₃) perovskites have demonstrated significant potential in optoelectronic devices. However, the stability and performance of these applications are critically influenced by electric fields and light soaking effect (LSE). The mechanisms by which these factors affect the photoluminescence (PL) and time-resolved photoluminescence (TRPL) characteristics of MAPbI₃ thin films are not yet fully understood. In this study, we constructed a symmetric lateral electrode structure (ITO/MAPbI₃/ITO) to systematically analyze the impact of varying electric field strengths and LSE wavelengths on the PL and TRPL characteristics of MAPbI₃ thin films. Our experimental results reveal that bias voltage significantly influences carrier recombination processes and transfer rates. Both forward and reverse bias voltages exhibit similar effects on the symmetric lateral electrode ITO/MAPbI 3 /ITO structure. As the bias voltage increases, the steady-state PL intensity of MAPbI 3 films decreases, and the TRPL decay time shortens. Additionally, our studies on different LSE indicate that higher photon energy has a more pronounced impact on the TRPL lifetime of MAPbI 3 films. This research elucidates the mechanisms by which electric fields and LSE affect the photophysical properties of MAPbI 3 perovskite films, providing new insights for optimizing the performance of these materials in optoelectronic devices.
研究领域:
材料科学
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光学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lele Qiu,Yulin Yang,Guohua Dong,Debin Xia,Mengru Li,Xiao Fan,Ruiqing Fan
As for the solution-processed MAPbI 3 film, the pinholes and gaps are an inevitable and undesirable phenomenon, which can usually lead to serious interface charge recombination due to the penetration of hole transport materials in perovskite solar cells (PSCs). Herein, a hydrophobic β-NaYF 4 :Yb,Er up-conversion ultrathin layer with particle size ca. 6 nm was first applied to modify the MAPbI 3 film for optimizing the surface of perovskite film. Thereby, the corresponding PSCs yield a significantly enhanced power conversion efficiency of 15.17% compared with that (13.32%) of the pristine PSCs. Furthermore, the PSCs also have a good stability in air atmosphere (relative humidity ≤45%) because of the introduction of this hydrophobic material. After a series of detailed investigations and comparison, it can be easily concluded that the filled pinholes and gaps in perovskite films via β-NaYF 4 :Yb,Er nanoparticles is the main reason for the performance enhancement of the β-NaYF 4 :Yb,Er based PSCs, which can result in an enhanced hole extraction efficiency and reduced interface charge recombination. As a conclusion, it is a feasible and effective approach for improving the photovoltaic performance of PSCs by filling up the pinholes and gaps in perovskite films with up-conversion ultrathin layers.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-6
·
IF 3.159
Shan Dan,Tong Guoqing,Cao Yunqing,Tang Mingjun,Xu Jun,Yu Linwei,Chen Kunji
Hybrid organic-inorganic perovskites (HOIPs) exhibit long electronic carrier diffusion length, high optical absorption coefficient, and impressive photovoltaic device performance. At the core of any optoelectronic device lie the charge transport properties, especially the microscopic mechanism of scattering, which must efficiently affect the device function. In this work, CH 3 NH 3 PbI 3 (MAPbI 3 ) films were fabricated by a vapor solution reaction method. Temperature-dependent Hall measurements were introduced to investigate the scattering mechanism in MAPbI 3 films. Two kinds of temperature-mobility behaviors were identified in different thermal treatment MAPbI 3 films, indicating different scattering mechanisms during the charge transport process in films. We found that the scattering mechanisms in MAPbI 3 films were mainly influenced by the decomposed PbI 2 components, which could be easily generated at the perovskite grain boundaries (GBs) by releasing the organic species after annealing at a proper temperature. The passivation effects of PbI 2 in MAPbI 3 films were investigated and further discussed with emphasis on the scattering mechanism in the charge transport process.
研究领域:
材料科学
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凝聚态物理
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半导体物理
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光伏器件
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纳米材料
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表面与界面科学
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功能材料
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电子输运
✓ 已验证
DOI
高影响因子
Nano Energy
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2019
·
IF 15.548
Yanbo Gao,Yanjie Wu,Hongbin Lu,Cong Chen,Yue Liu,Xue Bai,Lili Yang,William W. Yu,Qilin Dai,Yu Zhang
The quality of perovskite absorber is one of the most important factors to influence the efficiency and stability of perovskite solar cells (PSCs). However, it is still challenging to obtain perovskite layers with required properties including large grain sizes, better crystallinity , less grain boundaries, and uniform morphology by the current preparation techniques. Here we develop a novel method, where the CsPbBr 3 nanoparticles (NPs) are introduced into the chlorobenzene anti-solvent to improve the MAPbI 3 film quality in terms of film structure, morphology and crystallinity, leading to reduced charge recombination and improved charge transfer. CsPbBr 3 NPs play a role as nucleation centers in the growth process of perovskite films, and CsPbBr 3 NPs also induce a passivation layer Cs 1-y MA y PbI 3-x Br x on the top of perovskite layer. The charge transport and power conversion efficiency (PCE) are improved due to the introduction of CsPbBr 3 NPs. A champion PCE of 20.46% is obtained for the PSCs based on high quality perovskite film prepared with CsPbBr 3 NPs. In addition, the PSCs with CsPbBr 3 NPs also exhibit improved stability. This work not only demonstrates a novel strategy to prepare high quality perovskite films for PSCs with high efficiency and stability, but also provides important insight in the growth mechanisms of perovskite films toward high crystallinity and less defects.
研究领域:
材料科学
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可再生能源
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纳米技术
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光伏
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 17
·5806-5814
·
IF 6.4
Liufang Chen,Zhihang Zhang,Wenjing Zhai,Guangyuan Li,Lin Huang,Xinyu Li,Wenhao Zheng,Lin. Lin,Xiaohui Zhou,Zhibo Yan,Jun-Ming Liu
Hybrid organic–inorganic perovskites have attracted wide attention due to their excellent photoelectric properties, but their stability is still one of the main obstacles to large-scale applications. Recently, the introduction of electric dipoles has become a new strategy for improving the stability and performance of perovskites. Herein, we study the stability and the photoelectric properties of CH3NH3PbI3 (MAPbI3) films fabricated with the addition of different amounts of ferroelectric poly(vinylidene fluoride–trifluoroethylene) (P(VDF–TrFE)). It is demonstrated that a suitable addition of P(VDF–TrFE) not only enhances the crystalline stability but also improves the light absorption, photoluminescence, and photocurrent responses of MAPbI3. A series of measurements were carried out to reveal that the permanent electric dipole from P(VDF–TrFE) suppresses ion migration due to the electrostatic interaction with the defects and improves the photocarrier transport because of the enhanced electrostatic screening effect, which well explains the improvement of stability and performance of MAPbI3 films.
研究领域:
材料科学
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光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）