Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21143-21148
·
IF 9.931
Long Luo,Yulong Zhang,Nianyao Chai,Xi Deng,Jie Zhong,Fuzhi Huang,Yong Peng,Zhiliang Ku,Yi-Bing Cheng
Large-area, highly uniform CsxFA1−xPbI3−yBry mixed cation perovskite films were prepared by a facile vapor–solid reaction method. In this method, CsBr and PbI2 were first deposited via thermal evaporation, and then exposed to FAI/FACl vapor to form the CsxFA1−xPbI3−yBry perovskite. With the incorporation of CsBr, the crystallinity of the FAPbI3 perovskite could be significantly improved. Meanwhile, the FACl vapor could accelerate the growth rate of the CsxFA1−xPbI3−yBry perovskite in the vapor–solid reaction process. By optimizing the content of Cs and the ratio of FACl/FAI, we obtained high quality, pin-hole free Cs0.24FA0.76PbI3−yBry films. Based on these films, the small sized perovskite solar cells (PSCs) reached a champion power conversion efficiency (PCE) of 17.29%. Without encapsulation, the device with the Cs0.24FA0.76PbI3−yBry perovskite showed much better moisture and thermal stability in comparison to that with the pristine FAPbI3 perovskite. Furthermore, we also fabricated PSC modules with a size of 8 × 8 cm2 and achieved a PCE of 12.24%, indicating that such a vapor–solid reaction method has a certain superiority in the manufacture of large-scale PSCs.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Huamin Wang,Haodi Wu,Yeming Xian,Guangda Niu,Weinan Yuan,Huanyong Li,Hang Yin,Peng Liu,Yi Long,Wenzhe Li,Jiandong Fan
CsxFA1–xPbI3 single crystals are expected to provide more excitement in optoelectronic applications, including photodetector, laser, light-emitting diode, etc. Herein, we aim to gain an in-depth understanding of the growth mechanisms of perovskite single crystal with various morphologies in view of microscopic dynamics by the combination of component, structure, and solvent engineering. A sequence of CsxFA1–xPbI3 (0 ≤ x ≤ 0.14) perovskite single crystals with a dodecahedron morphology and tunable aspect ratio can be obtained by means of a solution-processed uniform-cooling approach. The optimized Cs0.1FA0.9PbI3 single crystals prepared in γ-butyrolactone mixed with dimethyl sulfoxide are theoretically and experimentally demonstrated to have superior performances, e.g., extremely higher long-term stability, lower trap density, and higher mobility. The broadband absorption, i.e., 300–910 nm, enables its application in near-infrared detection (880 nm), and the corresponding detector demonstrates higher responsivity at different light intensities and a fast photocurrent response (τ1 = 11 μs, τ2 = 10 μs). Equally important, we also explore the application of optimized Cs0.1FA0.9PbI3 single crystals with a tunable aspect ratio in an X-ray detector and the extremely high sensitivity (2772.1 μC Gyair–1 cm–2 under a bias of 150 V) demonstrates their good potential for radiation detection.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2020
·
IF 0
Zijian Peng,Qi Wei,Hao Chen,Yawen Liu,Fei Wang,Xianyuan Jiang,Weiyan Liu,Wenjia Zhou,Shengjie Ling,Zhijun Ning
Summary Dissociation of organic molecules is one critical factor leading to degradation of perovskite solar cells. The much-improved thermal stability of formamidinium (FA) can significantly reduce molecular dissociation; however, FA-based perovskite suffers from high defect density, which affects efficiency and long-term stability. In this work, based on a precise ion-exchange reaction at the grain surface, we fabricate a Cs 0.15 FA 0.85 PbI 3 /Cs x FA 1-x PbI 3 heterostructure with a Cs-rich Cs x FA 1-x PbI 3 quasi-shell structure. The Cs-rich inorganic structure on the perovskite surface increases defect formation energy and reduces defect density, leading to a power conversion efficiency of 20.7%. The encapsulated device maintains 95% of its initial efficiency after 1,000 h of continuous operation, corresponding to a calculated lifetime approaching 2 years. The device can operate at 60°C for 250 h and at 85°C for over 3,000 min, which is one of the best operational stabilities for Cs x FA 1-x PbI 3 -based devices.
研究领域:
材料科学
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太阳能
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纳米技术
✓ 已验证
DOI
ACS Applied Energy Materials
·
2024
·
IF 5.4
Yining Pan,Qiang Zeng,Linhong Li,Mingxin Deng,Xiang Liao,Mingjun Zhang,Wei Wang,Feng Xie,Fangyang Liu
Integrating cesium (Cs) into perovskite layers significantly enhances the stability of perovskite solar cells (PSCs), which is a critical aspect for achieving high efficiency. However, the elemental and phase segregation, caused by the inhomogeneous distribution of Cs within the perovskite film, poses a risk to the device’s lifetime. To address this issue, we present an innovative aqueous synthesis method for CsxFA1–xPbI3 (CsFA) microcrystals as precursors to perovskite thin films. These synthesized microcrystals ensure uniform cesium distribution across the perovskite grains, acting as a 3D scaffold for the crystallization process. This scaffold serves as a template, facilitating a homogeneous Cs distribution within the perovskite film. Utilizing these CsFA microcrystals, we achieved a maximum power conversion efficiency (PCE) of 23.70%, with the devices maintaining 96% of their initial PCE after 600 h in ambient conditions. Our innovative approach facilitates the mass production of high-purity CsFA microcrystals from cost-effective, low-purity starting materials, which is conducive to facile application for further commercialization.
研究领域:
材料科学
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可再生能源
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Paifeng Luo,Shengwen Zhou,Yugang Zhou,Wei Xia,Lin Sun,Jigui Cheng,Chenxi Xu,Yingwei Lu
Over the past few years, significant attention has been focused on HC(NH2)2PbI3 (FAPbI3) perovskite due to its reduced band gap and enhanced thermal stability compared with the most studied CH3NH3PbI3 (MAPbI3). However, FAPbI3 is sensitive to moisture and also encounters a serious structural phase-transition from photoactive α-phase to photoinactive δ-phase. Herein, we first develop a novel FAI gas-phase-assisted mixed-cation compositional modulation method to fabricate CsxFA1–xPbI3 perovskite solar cells (PSCs), and realize the structural stabilization of α-phase FAPbI3 with the incorporation of smaller inorganic Cs+ ions. Through the setting of different Cs+ contents (x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.50) along with a moderate FAI vapor deposition process, a series of CsxFA1–xPbI3 films with consistent compositions are fabricated, which perfectly resolves the main blocking problems of the conventional solution approach, such as difficulty in compositional control and rough film morphology. Meanwhile, we find that the Cs+ amount is crucial for generating phase-pure CsxFA1–xPbI3 (0 < x < 0.30) while higher contents result in phase segregation. Consequently, the optimum amount of Cs+ (x = 0.15) is verified, and Cs0.15FA0.85PbI3 shows the smallest unit cell volume and good moisture-resistant feature. Correspondingly, the highest power conversion efficiency (PCE) of 14.45% based on Cs0.15FA0.85PbI3 PSCs is successfully achieved in this work.
研究领域:
材料科学
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光伏技术
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钙钛矿太阳能电池
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薄膜制备
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）