Advanced Science
·
2021
·Vol. 8
·期 5
·2001466
·
IF 16.806
Yali Chen,Xuejiao Zuo,Yiyang He,Fang Qian,Shengnan Zuo,Yalan Zhang,Lei Liang,Zuqin Chen,Kui Zhao,Zhike Liu,Jing Gou,Shengzhong (Frank) Liu
So far, most techniques for modifying perovskite solar cells (PSCs) focus on either the perovskite or electron transport layer (ETL). For the sake of comprehensively improving device performance, a dual-functional method of simultaneously passivating trap defects in both the perovskite and ETL films is proposed that utilizes guidable transfer of Eu 3+ in SnO 2 to perovskite. Europium ions are distributed throughout the SnO 2 film during the formation process of SnO 2 , and they can diffuse directionally through the SnO 2 /perovskite interface into the perovskite, while most of the europium ions remain at the interface. Under the synergistic effect of distributed Eu 3+ in the SnO 2 and aggregated Eu 3+ at the interface, the electron mobilities of ETLs are evidently improved. Meanwhile, diffused Eu 3+ ions passivate the perovskite to reduce trap densities at the grain boundaries, which can dramatically elevate the open-circuit voltage ( V oc ) of PSCs. Finally, the mainly PSCs coated on SnO 2 :Eu 3+ ETL achieve a power conversion efficiency of 20.14%. Moreover, an unsealed device degrades by only 13% after exposure to ambient atmosphere for 84 days.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jin Xie,Ziren Zhou,Hongwei Qiao,Mengjiong Chen,Lijie Wang,Shuang Yang,Yu Hou,Huagui Yang
A controllable crystallization is of practical importance to produce high-quality perovskite thin films with reduced structural defects. Lewis bases as electron-pair donor chemicals can strongly coordinate to lead ions and have been extensively employed to manipulate the growth of perovskite crystals. In this work, we demonstrate a series of Lewis-base amides, for morphological regulation of methylammonium lead triiodide (MAPbI 3 ) thin films. The screened acetamide was demonstrated to decently improve the grain size, along with a spatial distribution at grain boundaries (GBs). The mesostructured solar cells of acetamide-modified absorbers yielded an optimized power conversion efficiency (PCE) of 20.04% with a mitigated open-circuit voltage ( V OC ) deficit of 0.39 V. This work provides a facile and cost-effective strategy toward controllable fabrication of high-performance MAPbI 3 solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenyu Qiu,Yukun Wu,Yichen Wang,Zhiting Yang,Rui Yang,Chenxi Zhang,Yang Hao,Yuying Hao
Hybrid halide perovskite solar cells (PSCs) have enormous potential to provide energy for future space exploration and aerospace due to their unique advantages in harsh environments. Unfortunately, it is challenging to fabricate robust PSCs that are insensitive to low temperatures. This study presented the performance evolution of methylammonium triiodide (MAPbI 3 ) PSCs across a temperature range of 290 to 90 K and highlighted the decisive impact of interfacial defects on the devices’ low-temperature performance. The introduction of polymethyl methacrylate (PMMA) as interface modification layer, efficiently passivated the interface defects, released the interfacial stress, and thus decreased the phase transition temperature. As a result, the PMMA-modified device achieved a maximum efficiency of 22.4% at 90 K which was one of the highest efficiencies reported for MA-based PSCs at low temperatures. Remarkably, the PMMA-modified device retained nearly 100% of initial efficiency after 26 temperature cycling tests between 290 and 90 K, whereas the control device maintained only 62% of initial efficiency. This work demonstrated that interface engineering is a promising strategy for improving the low-temperature performance of PSCs.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Yingjun Chai,Zhili Juan,Ye Wu,Yang Liu,Xiaoming Li
Metal halide perovskites have been demonstrated as potential X-ray detection materials due to their high defect tolerance, large diffusion length, and high attenuation efficiency. X-ray detectors based on hot-pressed perovskite wafers are investigated intensively recently because of the convenience of scalable fabrication. However, in spite of the large crystal size within wafers, the prepared detectors usually suffer from severe ion migration and current drift under both dark and bright states. In this work, ethylenediamine dihydroiodate (EDDI) was introduced as a strong surface passivation agent, which compensated for the surface iodide vacancy successfully. The ion migration in optimal MAPbI3@EDDI wafer is significantly suppressed, which is manifested by increased migration activation energy and stable current under high bias for 10 h. Moreover, the introduction of EDDI also reduced the dark current, contributing a high on–off ratio and a champion sensitivity of 8291.22 μC Gyair–1 cm–2. A low detection limit of 340 nGyair s–1 is also obtained, which is much lower than that of commercial X-ray detectors. Besides, the as-fabricated X-ray detector can endure long-term operation with flat current under a high bias of 20 V. This work provides a route for the performance improvement of perovskite wafer-based X-ray detectors.
研究领域:
材料科学
·
物理学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 10
·3633-3641
·
IF 10.182
Yuying Cui,Shurong Wang,Chengbo Li,Aili Wang,Jing Ren,Chenguang Yang,Bin Chen,Zhen Wang,Feng Hao
Antisolvent assisted crystallization has been most widely applied in depositing high-quality perovskite thin films for efficient perovskite solar cells (PSCs). However, the toxicity of common antisolvents (chlorobenzene, toluene etc.) involved in perovskite processing raises serious environmental and health concerns for large-scale implementation. Herein, a green co-antisolvent of propyl acetate is induced to adjust the degree of supersaturation in diethyl ether, enabling pinhole-free, smooth, and uniform perovskite thin films. By carefully controlling the polarity of the antisolvents, the deposited perovskite film showed higher electron mobility and suppressed defect density than that of the control film. As a result, a high power conversion efficiency up to 20.61% was achieved in a p–i–n inverted MAPbI3 PSC with an impressive fill factor (FF) over 84%. The high FF is mainly attributed to the attenuated ideal factor and improved diode junction quality. This approach provides a greener path to the sustainability and scalability of the emerging PSC technology.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
DOI
高影响因子
Energy Material Advances
·
2022
·
IF 0
Jinxing Yu,Xiaoxiang Xu
Halide perovskites have been emerging as promising photocatalytic materials for H 2 evolution from water due to their outstanding photoelectric properties. However, the lack of proper surface reactive sites greatly hinders the photocatalytic potential of these fascinating compounds. Here, Mo 2 C nanoparticles have been anchored onto methylammonium lead iodide (MAPbI 3 ) as a nonnoble metal cocatalyst to promote H 2 evolution reactions. The Mo 2 C nanoparticles have opposite zeta potential with MAPbI 3 thereby electrostatically assembled onto the MAPbI 3 surface, i.e., Mo 2 C@MAPbI 3 . Our results show that the anchored Mo 2 C nanoparticles have a strong interplay with MAPbI 3 substrate so that photogenerated electrons of MAPbI 3 can be rapidly separated and transferred into Mo 2 C for further H 2 evolution reactions. Under optimal conditions, Mo 2 C@MAPbI 3 delivers exceptionally high photocatalytic performance for visible light-driven H 2 evolution that clearly outperforms pristine MAPbI 3 and Pt-deposited MAPbI 3 . An apparent quantum efficiency as high as 12.65% at 600 ± 40 nm has been attained for H 2 evolution, surpassing most of the MAPbI 3 -based photocatalyst reported. These results signify the usefulness and applicability of Mo 2 C as a new nonnoble metal-based cocatalyst in solar water splitting.
研究领域:
材料科学
·
光催化
·
能源化学
·
半导体物理
·
纳米催化
·
太阳能转化
·
水裂解制氢
✓ 已验证
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Su-Yan Zou,Yu-Hua Huang,Yu-Chuang Fang,Cong-Yi Sheng,Dong-Dong Huang,Dai-Bin Kuang,Xu-Dong Wang
Large-area perovskite (PVK) X-ray detectors exhibit significant potential for commercial applications. However, the production of uniform and dense thick films as well as achieving efficient carrier transport over tens of microns in thick PVK films, remain major challenges for highly sensitive X-ray detection. Herein, an innovative vacuum-assisted blade coating strategy is proposed using PVK inks that strictly controls the nucleation and growth of PVKs to prepare large-area, high-quality MAPbI 3 homojunction thick films. Arising from the formation of a type II homojunction between the top and bottom PVK layers, and effective reduction of the density of defect states, the resultant homojunction film exhibits impressive performances, including an increase in carrier lifetime from 1272 to 9335 ps, an increase in surface photovoltage change from 93 to 386 mV, and nearly three times higher carrier mobility-lifetime product compared with pristine NMP-PVK film. Consequently, the X-ray detector based on homojunction film demonstrates a high sensitivity of 1.3 × 10 5 µC Gy air −1 cm −2 , surpassing the most previously reported values for X-ray detector using blade coating method. This research provides a convenient approach for preparing large-area PVK thick films and establishes a solid foundation for the development of X-ray detection.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dan Liu,Yuxiao Guo,Yawei Yang,Jie Liu,Xingtian Yin,Wenxiu Que
The organic-inorganic halide perovskite (OIHP) materials are becoming promising, but there is still inherent defect-mediated-carrier recombination in hybrid perovskite materials, thus, leading to inefficient power conversion efficiency (PCE). The defect states, which act as the recombination centers, are usually formed during crystallization process . Here, by a hot injection method, Na 2 S ligand exchange is applied to synthesize copper indium selenium quantum dots (CuInSe 2 QDs), which are well dispersed in N,N-dimethylformamide (DMF) and then added into perovskite precursor solution. The resulted QD-in-perovskite structure is found to be beneficial for enlarging grain size, and thus exhibits an improved crystallinity and absorption due to the passivation of trap states. Hence, the perovskite solar cell (PSC) based on the MAPbI 3 -CuInSe 2 QD hybrid film show an improved carrier lifetime from 58.17 ns to 243.23 ns and an enhanced PCE from 16.3% to 18.4% due to higher open-circuit voltage, compared to the cell device based on the pure perovskite film. Additionally, the optimized cell device presents better stability, which can still keep 75% of the initial PCE after 20-day storage. Such a simple Na 2 S ligand exchange to introduce QD into perovskite provides strong potential for preparing other hybrid materials .
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
·
2021
·
IF 3.752
Xianshuang Wang,Sushu Wan,Yage He,Suling Qiu,Xiao Ma,Nasrullah Wazir,Ruibin Liu,Yuxi Tian
The photoelectric efficiency and degradation mechanism of methylammonium lead iodide (MAPbI3) thin film based device is highly determined by elemental composition and localized distribution. However, the total element analysis of perovskite films is still a huge challenge with current analytical techniques. The quantitative analysis of all elements are tried based on Laser Induced Breakdown Spectroscopy (LIBS) for the first time. The distribution of stoichiometric ratios of plumbum to carbon ([Pb]/[C]) on the films is determined by calibration-free LIBS, which illustrates locally elemental inhomogeneity and stoichiometric ratio deviation. Furthermore, low Limits of Detection (LoD) are obtained based on calibration procedure with a high determination coefficient R2 = 0.99, especially a relatively low LoD of 1.76 ppm and 39.54 ppm for nitrogen and hydrogen are respectively realized, which are lower than that of ever reported results. Interestingly, after laser ablation , a fluorescence decay phenomenon in and around the laser-ablated crater is observed. Our results provide a feasibility qualitative analytical methods based on LIBS to realize reliable determination of all elements in the MAPbI3 thin film with high accuracy and fast speed.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Qinyong Dai,Xinda Chen,Rongzheng Ding,Yingquan Peng,Wenli Lv,Zhuoli Zhou,Sunan Xu,Lei Sun
As new-type optoelectronic materials, organometallic halide perovskites (MAPbX 3 , X = I, Br, Cl) is an emerging solution-processable material with excellent optoelectronic performances that can be used for photodetectors and solar cells. Here, the effects of electrode materials (Au, Ag and Cu) on MAPbI 3 single crystal photodetectors are investigated. Among the three MSCPs, the one with Au electrode exhibits the lowest dark current of 0.01 μA, which indicate that the electron drift current is the dominant component of dark current in MAPbI 3 single crystals. While for the 650 nm wavelength illumination, the one with Ag electrode has largest R of 24.5 A/W and highest external quantum efficiency ( EQE ) of 4676% due to lower electron injection energy barrier at the contact. More importantly, the C 60 layer and CuPc:C 60 bulk heterojunction layer were used to modify the Au electrode respectively, a large R of 174 A/W and EQE of 33,354% is obtained by C 60 :CuPc-MSCP and C 60 -MSCP exhibits the largest PDR of 15,952 and D* of 4.5 × 10 13 Jones. These results suggest that lateral photodetectors based on MAPbI 3 single crystal modified by heterojunction buffer layer will obtain better optical performance.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Jiadong Zang,Caiyun Zhang,Yue Qiang,Qi Liu,Yuemeng Fei,Ze Yu
Metal halide perovskite solar cells (PSCs) have made remarkable progress recently. However, the large number of defects in the polycrystalline perovskite film has an important impact on the carrier recombination and ion migration in the device. The non-radiative recombination is regarded as the main way of charge loss, which largely determines the performance of PSCs. Here, a small molecule, 2-mercaptopyrimidine (MPM), was selected as the surface passivator for MAPbI 3 perovskite films. It is revealed that both S and N atoms in MPM can interact with uncoordinated Pb 2+ to passivation the surface defects. As a result, the devices based on MPM passivation achieve a higher power conversion efficiency (PCE) of 19.71% than the control devices (17.85%) due to the reduced surface defect state density. Moreover, MPM-passivated PSCs also possess superior humidity stability, retaining 94% and 82% of the initial PCEs after 720 and 480 h aging in air with a relative humidity of 30% and 60%, respectively.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Fengjun Chun,Binbin Zhang,Yuchen Li,Wen Li,Meilin Xie,Xiaodong Peng,Cheng Yan,Zi Chen,Haitao Zhang,Weiqing Yang
Methyl-ammonium lead iodide (MAPbI 3 ) perovskite quantum dots (QDs) have emerged as a promising material for photoelectronic, however, they usually suffer intrinsically from the environmental instability and low photoluminescence quantum yield (PLQY), which will seriously impede their commercial applications. Here, we report an internal-external combination strategy by lowering the dose of good solvent and reducing the chain length of amine ligand to simultaneously enhance the air stability and PLQY of MAPbI 3 QDs. The low-dose solvent can effectively reduce internal iodine vacancies defects and external residual solvent molecules, meanwhile, the faster and denser assembly of nimble short-chain (SC) ligand on the MAPbI 3 QDs surface can helpfully enhance the external surface passivation. As a result, compared to MAPbI 3 QDs synthesized by traditional ligand-assisted reprecipitation (LARP) method, the air stability and PLQY of which are improved by more than four orders of magnitude (from a few minutes to dozens of days) and nearly two times (from 42% to 80%) prepared by our strategy. Besides, this strategy can widely tune the color of MAPbX 3 (X = Cl, Br, I) QDs from 388 to 735 nm through regulating components. This internal-external combination strategy can provide some beneficial enlightenment for preparing long-term air-stable hybrid perovskite QDs with high PLQY, which drastically driving their commercial applications.
研究领域:
材料科学
·
光电化学
✓ 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）