JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 2
·1008-1012
·
IF 1.134
Zhao Xiao-Chong,Wu Dong-Xue,Yang Li-Jun,Tang Jun,Yue Guo-Zong,Yang Pan
Institute of Materials, Chinese Academy of Engineering Physics, Jiangyou 621908, P. R. China To improve the stability of organic–inorganic hybrid perovskite, cesium-containing methylammonium lead iodide perovskite have been synthesized by one-step solution deposition. With the
increasing of Cs+ doping concentration, direct optical band gap of perovskite was increases, while defects and roughness of perovskite thin films were gradually augmented. A certain amount of Cs+ incorporated in perovskite absorb layer could improve power conversion efficiency
through the enhancing of open circuit voltage and fill factor. However, excessive Cs+ doping concentration results in the reduced of short-circuit current and fill factor, which reduced power conversion efficiency. The optimized ratio 10% Cs+ doping achieved the highest
power conversion efficiency (16.84%).
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Ya Xu,Yin Huang,Hang Zhong,Wenbo Li,Duoling Cao,Congqiang Zhang,Huaxi Bao,Zhiguang Guo,Li Wan,Xu Zhang,Xiuhua Zhang,Yuebin Li,Xianbao Wang,Dominik Eder,Shimin Wang
Methylammonium lead iodide perovskite (MAPbI3) demonstrates the disadvantage of poor long-term stability. Additive engineering is an effective measure to address this issue. We have successfully used an organic molecule called p-methylbenzoammonium iodate (p-MePMAI) as an additive to a perovskite precursor. Results showed that p-MePMAI is an excellent additive with functional groups of benzyl and ammonium ions that can improve the performance and stability of carbon counter electrode (CE)-based MAPbI3 perovskite solar cells. Benzene rings and ammonium ion functional groups of p-MePMAI can electrostatically interact with MAPbI3 when a proper amount of p-MePMAI is added. Moreover, the conjugated structure of the benzene ring can effectively reduce the number of trap states in the perovskite film and significantly inhibit nonradiative recombination, further promoting charge transport. The photoelectric conversion efficiency (PCE) of our prepared carbon CE-based MAPbI3 perovskite solar cells increases from 12.76 to 14.54% with the optimization of p-MePMAI. Notably, the device optimized using p-MePMAI additives maintains 85% of the initial PCE after 500 h.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Jiajia Jiang,Hai jun Tao,Shanlong Chen,Bin Tan,Ning Zhou,Lumin Zhu,Yuan Zhao,Yuqiao Wang,Jie Tao
Sequential spin-coating procedure is a widely adopted strategy to prepare CH 3 NH 3 PbI 3 on mesostructured TiO 2 electrode for organolead halide perovskite-based solar cells. However, this method suffers from the rough surface and excessively residual PbI 2 in the resulting perovskite film, deteriorating the device performance seriously. Herein, a facial modified sequential solution deposition method, by introducing an as-prepared CH 3 NH 3 PbI 3 and PbI 2 film before the traditional two-step process, was proposed to fabricate the perovskite-based solar cell with smooth morphology and trace amount of remaining PbI 2 . The optimal as-prepared film introduced improves the efficiency of CH 3 NH 3 PbI 3 solar cells from 9.11% to 11.16%. The enhancement of device performance can be attributed to the increased light absorption ability and decreased recombination rate of carriers in CH 3 NH 3 PbI 3 absorber.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·3145-3153
·
IF 10.733
Bing Liu,Rongli Cui,Huan Huang,Xihong Guo,Jinquan Dong,Huanli Yao,Ying Li,Dangui Zhao,Jiahao Wang,Jing Zhang,Yu Chen,Baoyun Sun
In this study, the stability mechanism of the optimized methyl ammonium lead triiodide (CH3NH3PbI3, MAPbI3)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) perovskite active layer upon exposure to moisture, light, and heating was investigated. For the first time, the existence of high-valence lead arising from PCBM is confirmed by X-ray absorption fine spectroscopy (XAFS) based on synchrotron radiation, which helps to form stronger Pb–I bonds and facilitate carrier transport. Moreover, the degree of disorder of perovskites and the [PbI6]4− octahedral distortion are significantly improved, as well as the crystallization both on the surface and in the bulk. The result of this study provides a fundamental understanding of the functions of additives with electron-withdrawing properties (e.g., PCBM) in perovskite materials and could specifically be extended to systematically design and fabricate high-efficiency and stable solar cells.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
VACUUM
·
2022
·
IF 4.11
Cong Peng,Baizhen Qian,Qianliu Yin,Meifeng Xu,Yonglong Jin,Chaonan Wang,Xiyuan Ma,Tian Xu
The photoelectronic materials of hybrid organic-inorganic halide perovskite (HHPs) materials are an important research field. However, the defects on the surface of perovskite films need to be solved. For organic-inorganic halide perovskite materials, oxygen passivation has been regarded as an effective and convenient method to inhibit non-radiative recombination. In this paper, the unannealed CH 3 NH 3 PbI 3 precursor films were passivated by oxygen plasma for different irradiation times. The prepared perovskite films have large grain sizes, lower trap density, improved crystallinity, and strong absorption. The J-V curve shows that the HHPs solar cells with oxygen treatment increase the solar cell's overall photoelectric conversion efficiency (PCE) from 10.24% to 14.23%. Experimental results and analysis demonstrate that oxygen plasma successfully passivates the surface defects of perovskite, minimizes non-radiation recombination, and enhances device stability.
研究领域:
材料科学
·
太阳能电池技术
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Weidong Zhu,Lei Kang,Tao Yu,Bihu Lv,Yangrunqian Wang,Xingyu Chen,Xiaoyong Wang,Yong Zhou,Zhigang Zou
Herein, we demonstrate that the facile face-down annealing route which effectively confines the evaporation of residual solvent molecules in one-step deposited precursor films can controllably enable the formation of (110) textured CH3NH3PbI3 films consisting of high-crystallinity well-ordered micrometer-sized grains that span vertically the entire film thickness. Such microstructural features dramatically decrease nonradiative recombination sites as well as greatly improve the transport property of charge carries in the films compared with that of the nontextured ones obtained by the conventional annealing route. As a consequence, the planar-heterojunction perovskite solar cells with these textured CH3NH3PbI3 films exhibit significantly enhanced power conversion efficiency (PCE) along with small hysteresis and excellent stability. The champion cell yields impressive PCE boosting to 18.64% and a stabilized value of around 17.22%. Particularly, it can maintain 86% of its initial value after storage for 20 days in ambient conditions with relative humidity of 10–20%. Our work suggests a facile and effective route for further boosting the efficiency and stability of low-cost perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yuanhao Li,Yukun Wang,Zuhuan Lu,Zongming Yu,Tianyi Zhang,Wenhong Sun
Methylammonium lead iodide is widely used in the preparation of photodetectors because of its excellent photovoltaic properties. However, because of the nature of the perovskite polycrystals, the low-temperature solution treatment approach of creating perovskite thin films causes flaws to arise in the material. Undercoordinated lead ions (Pb2+) have been shown to have comparatively low formation energies among all defect species and to be a major contributor to defect creation. Here, we use a straightforward but efficient additive engineering strategy to introduce tetrafluoroterephthalonitrile as an additive into the perovskite precursor solution to passivate perovskite defects and improve the quality of perovskite thin films for the production of high-efficiency perovskite photodetectors. We demonstrated that –CN (cyano) and polyfluorine atoms in the structure of TFTPN may passivate defects caused by lead ions and prevent the releasing of organic cations (MA+), improving the stability of the perovskite structure and the quality of perovskite films. Consequently, we designed perovskite photodetectors with TFTPN that demonstrated exceptional performance in terms of photoresponse, detection and other areas. These devices had a maximum peak external quantum efficiency (EQE) of 91.73%, a lower dark current density of 8.86 × 10−11 A cm−2, a linear dynamic range (LDR) of 105.4 dB, and more. Furthermore, the perovskite photodetector's durability is enhanced by the addition of TFTPN, and after 20 days of storage in an air environment at 25 °C and 20–30% relative humidity, the device retains its original efficiency of 92.3%.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 12
·5427-5434
·
IF 7.394
Weidong Zhu,Tao Yu,Faming Li,Chunxiong Bao,Hao Gao,Yong Yi,Jie Yang,Gao Fu,Xiaoxin Zhou,Zhigang Zou
A high-quality CH3NH3PbI3 film is crucial in the manufacture of a high-performance perovskite solar cell. Here, a recrystallization process via facile fumigation with DMF vapor has been successfully introduced to self-repair of CH3NH3PbI3 films with poor coverage and low crystallinity prepared by the commonly used one-step spin-coating method. We found that the CH3NH3PbI3 films with dendritic structures can spontaneously transform to the uniform ones with full coverage and high crystallinity by adjusting the cycles of the recrystallization process. The mesostructured perovskite solar cells based on these repaired CH3NH3PbI3 films showed reproducible optimal power conversion efficiency (PCE) of 11.15% and average PCE of 10.25 ± 0.90%, which are much better than that of devices based on the non-repaired CH3NH3PbI3 films. In addition, the hysteresis phenomenon in the current–voltage test can also be effectively alleviated due to the quality of the films being improved in the optimized devices. Our work proved that the fumigation of solvent vapor can modify metal organic perovskite films such as CH3NH3PbI3. It offers a novel and attractive way to fabricate high-performance perovskite solar cells.
研究领域:
材料科学
·
太阳能技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Can Cui,Danyan Xie,Ping Lin,Haihua Hu,Siyuan Che,Ke Xiao,Peng Wang,Lingbo Xu,Deren Yang,Xuegong Yu
High-quality perovskite films with uniform coverage and large grains are indispensable to enhance the performance of perovskite solar cells with high efficiency and stability. However, solution-processed perovskite films usually possess small grains associated with abundant grain boundaries, which induce high trap state density and then seriously degrade the device performance. In this paper, the volatile Lewis base, thioacetamide (TAA), is employed as an additive to fabricate high-quality methylammonium lead iodide (MAPbI 3 ) films. The average grain size of perovskite films increases continuously with increasing TAA content and reaches a maximum value of 960 nm in the sample with 1.0% TAA. However, the average gain size drops dramatically to the value of samples without TAA when TAA content increases to 2.0%, and then the average gain size keeps nearly unchanged upon further increasing TAA content up to 10%. This unusual grain size variation tendency is attributed to the volatility of additive, and a mechanism is proposed based on various characterizations to illustrate how volatile TAA improves perovskite film crystallization. Furthermore, the device based on the MAPbI 3 film with 1.0% TAA shows a superior PCE of 18.9% and improved stability that the device with 1.0% TAA retains 88.9% of its initial performance after aging 816 h in the air with 25–35% relative humidity. The results strongly suggest that the TAA-modified MAPbI 3 films as absorber layers can significantly enhance the performance of the perovskite solar cell due to large grains, high crystallization and reduced trap state density of the high quality TAA-modified MAPbI 3 films.
研究领域:
材料科学
·
太阳能电池技术
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Bowen Zhang,Fei Cheng,Zeyu Sun,Kunpeng Xing,Bo Zhang,Saisai Zhang,Hari Bala,Yan Wang
Organic-inorganic hybrid perovskite materials have garnered significant research interest owing to their exceptional crystallographic characteristics and remarkable optoelectronic properties. This study presents a breakthrough in room-temperature ammonia sensing through the rational design of CH 3 NH 3 PbI 3 (MAPbI 3 )-based chemiresistive sensors modified with monoethanolamine (MEA) ligands. By integrating MEA as a coordination agent into the perovskite precursor solution, we achieved controlled crystallization dynamics, yielding compact MAPbI 3 films with unique maple-leaf grain morphology and enhanced humidity resistance. The optimized TiO 2 /MEA-MAPbI 3 sensor exhibited a nearly 2.1-fold improvement in response amplitude toward 100 ppm NH 3 compared to unmodified counterparts, alongside exceptional selectivity to NH 3 against interfering gases. Crucially, MEA-derived (PbI 2 )-MEA-(MAI) molecular shielding layers at grain boundaries suppressed moisture-induced degradation, enabling stable operation in air environment (∼30 %RH) with less than 22 % response degradation over 29 days. Mechanistic analyses revealed that the sensing behavior originates from reversible cation exchange between methylammonium (MA + ) and ammonium (NH 4 + ) species at the perovskite surface, corroborated by density functional theory (DFT) calculations showing preferential NH 3 adsorption over other analyte gases.
研究领域:
材料科学
·
化学传感器
·
理论计算
✓ 已验证
DOI
高影响因子
Research
·
2020
·
IF 0
Yilong Song,Liqi Li,Weihui Bi,Mingwei Hao,Yifei Kang,Anran Wang,Zisheng Wang,Hanming Li,Xiaohui Li,Yanjun Fang,Deren Yang,Qingfeng Dong
Organic-inorganic halide perovskites (OIHPs) are recognized as the promising next-generation X-ray detection materials. However, the device performance is largely limited by the ion migration issue of OIHPs. Here, we reported a simple atomistic surface passivation strategy with methylammonium iodide (MAI) to remarkably increase the ion migration activation energy of CH3NH3PbI3 single crystals. The amount of MAI deposited on the crystal surface is finely regulated by a self-assemble process to effectively suppress the metallic lead defects, while not introducing extra mobile ions, which results in significantly improved dark current stability of the coplanar-structure devices under a large electric field of 100 V mm-1. The X-ray detectors hence exhibit a record-high sensitivity above 700,000 μC Gyair‐1 cm‐2 under continuum X-ray irradiation with energy up to 50 keV, which enables an ultralow X-ray detection limit down to 1.5 nGyair s-1. Our findings will allow for the dramatically reduced X-ray exposure of human bodies in medical imaging applications.
研究领域:
材料科学
·
医学成像
·
半导体物理
✓ 已验证
DOI
CRYSTENGCOMM
·
2016
·Vol. 18
·期 23
·4405-4411
·
IF 3.849
Jie Ding,Huajing Fang,Zhipeng Lian,Jiangwei Li,Qianrui Lv,Liduo Wang,Jia-Lin Sun,Qingfeng Yan
Methylammonium lead iodide perovskite (MAPbI3) has made a re-entry into the literature nowadays for its extraordinary characteristics, such as high absorption of light, long carrier diffusion length, high carrier mobility, low trap-state density, low surface recombination velocity and ease of attainment. Here, we report a self-powered photodetector based on a CH3NH3PbI3 single crystal by employing asymmetric Au–Al electrodes. The key issue of this photodetector was the metal–semiconductor contacts, owing to the Schottky junction between them. By setting the channel length between the Au–Al electrodes to 30 μm for sufficient electron–hole pair separation and transportation, the device showed good performance under 1 sun illumination. The short-circuit photocurrent density and open-circuit voltage were 6.86 mA cm−2 and 0.7 V, respectively. The photocurrent was almost 2 orders of magnitude larger than that based on a perovskite polycrystalline film with a similar device structure. More importantly, the device could detect the lowest noticeable incident power density down to 1 × 10−8 W cm−2. Under this weak light intensity, the responsivity was as high as 0.24 A W−1 without any bias. The photoresponse also had a broadband ranging from 375 nm to 808 nm accompanied by a fast response speed.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）