Journal of Materiomics
·
2021
·
IF 6.425
Xingyu Pu,Jian Han,Shuangjie Wang,Hui Zhou,Qi Cao,Jiabao Yang,Ziwei He,Xuanhua Li
The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI 2 Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI 2 Br perovskite. However, most modifiers behave high volatility and insulation, not enough to further develop the CsPbI 2 Br solar cells. Herein, an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI 2 Br film surface, yielding a compact film with enhanced crystallinity. The surface trap states of CsPbI 2 Br film are effectively passivated via the interaction between carbonyl group of [PEVIM]Cl and uncoordinated metal cations of CsPbI 2 Br perovskite, leading to charge recombination suppression and charge transport enhancement. Consequently, the power conversion efficiency (PCE) of [PEVIM]Cl modified CsPbI 2 Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V. Moreover, the non-encapsulated device presents excellent thermal stability, still maintaining 91% PCE when heated at 85 °C in nitrogen atmosphere for 360 h. Meanwhile, the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h. This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Huan Zhao,Zhuo Xu,Yuhang Che,Yu Han,Shaomin Yang,Chenyang Duan,Jian Cui,Songyuan Dai,Zhike Liu,Shengzhong (Frank) Liu
All-inorganic CsPbI 2 Br is a promising candidate to produce the optimized balance between efficiency and stability. Unfortunately, the CsPbI 2 Br perovskite films prepared by solution methods often show numerous defects on the grain surfaces and a tendency for phase transition. In this work, we discovered that the proper amount of NiI 2 additive enables Ni 2+ doping in the perovskite interstitial lattice, while additional Ni 2+ ions serve as passivation agents on the grain surfaces; in particular, a profiled distribution appears from the film bulk to both the upper and lower surfaces. The special Ni 2+ distribution results in an optimized TiO 2 surface for perovskite growth, better perovskite film quality, superior charge extraction capability, and effective suppression of interfacial recombination. As a result, the CsPbI 2 Br perovskite solar cell (PSC) efficiency is increased to 15.88%, among the highest for its type. Also, the special Ni 2+ distribution endows the PSC with improved moisture tolerance. This work provides a promising strategy to overcome the surface/bulk instability issues common in PSCs.
研究领域:
材料科学
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能源科学
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Junhan Zhang,Chenyue Wang,Chenyang Shen,Muyang Chen,Bingchen He,Zhenhuang Su,Liang Cao,Xingyu Gao
Understanding the interfacial energetics between metal halide perovskites and organic charge transport layers is critical for optimizing charge transport and achieving high-performance optoelectronic devices. While significant progress has been made in improving device efficiency, the fundamental interfacial electronic structure, particularly the influence of fabrication methods on energy level alignments, remains insufficiently explored. In this study, we compare CsPbI 2 Br films fabricated via spin coating and vacuum co-evaporation, using rubrene as a model hole-transporting layer. Ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS) reveal that spin-coated CsPbI 2 Br films contain surface iodine vacancies and dangling bonds, which facilitate chemical interactions with rubrene. This results in the emergence of a new state below the valence band maximum and a relatively large hole injection barrier of ∼ 0.6 eV. In contrast, vacuum-evaporated CsPbI 2 Br films exhibit smoother, defect-less surfaces that interact physically with rubrene. The resulting interfacial electron transfer induces a band bending like effect, along with a reduced hole injection barrier of ∼ 0.4 eV, favoring more efficient hole collection. These findings highlight the critical role of fabrication techniques in modulating interfacial energetics and charge injection barriers through structural and electronic modifications, offering essential insights into interface engineering strategies for optimizing the performance of perovskite-based optoelectronic devices.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
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IF 4.494
Xiaoxian Song,Fuguo Wang,Hongwen Li,Haiting Zhang,Ze Xu,Dongdong Wei,Jingjing Zhang,Zijie Dai,Yunpeng Ren,Yunxia Ye,Xudong Ren,Jianquan Yao
Ultraviolet–visible–near-infrared broad-band PDs have attracted great attention for imaging systems and optical communications. Previous UV–NIR PDs have mainly worked in a single band. UV–NIR dual-modal detectors, which maintain a greater light response through nonlinear light absorbance in the second mode, remain to be explored. Here, a CsPbI2Br dual-mode PD is reported for the first time. The light absorption, phase stability, and chemical stability of CsPbI2Br are enhanced by CsBr and H2O. The device shows (UV–vis)/NIR absorption through one-photon and two-photon absorption. The CsPbI2Br PD has excellent (UV–vis)/NIR dual-mode detection performance under ultraviolet (405 nm), visible (532 nm) and near-infrared (808 nm) illumination, respectively; the device has high responsivities of 160, 36, and 118 A/W, specific detectivities of 4.9 × 1011, 6.3 × 1010, and 2.1 × 1011 jones and response times of 5.5/6.8, 5.3/5.9, and 5.9/6.4 ms, respetively. This work provides a route for UV–NIR dual-mode detection and promotes the applications of these PDs in photoelectric devices for weak light and wide spectrum detection.
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 5
·547
·
IF 2.589
Zengguang Tang,Liujiang Zhang,Zhenhuang Su,Zhen Wang,Li Chen,Chenyue Wang,Guoping Xiao,Xingyu Gao
In this article, CsPbI2Br perovskite thin films were spin-coated on FTO, on which CuPc was deposited by thermal evaporation. The electronic structure at the CsPbI2Br/CuPc interface was examined during the CuPc deposition by in situ X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurements. No downward band bending was resolved at the CsPbI2Br side, whereas there is ~0.23 eV upward band bending as well as a dipole of ~0.08 eV identified at the molecular side. Although the hole injection barrier as indicated by the energy gap from CsPbI2Br valance band maximum (VBM) to CuPc highest occupied molecular orbital (HOMO) was estimated to be ~0.26 eV, favoring hole extraction from CsPbI2Br to CuPc, the electron blocking barrier of ~0.04 eV as indicated by the offset between CsPbI2Br conduction band minimum (CBM) and CuPc lowest unoccupied molecular orbital (LUMO) is too small to efficiently block electron transfer. Therefore, the present experimental study implies that CuPc may not be a promising hole transport material for high-performance solar cells using CsPbI2Br as active layer.
研究领域:
材料科学
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光伏器件
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表面科学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2019
·Vol. 7
·期 1
·1901952
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IF 15.804
En-Chi Shen,Jing-De Chen,Yu Tian,Yu-Xin Luo,Yang Shen,Qi Sun,Teng-Yu Jin,Guo-Zheng Shi,Yan-Qing Li,Jian-Xin Tang
Inorganic mixed-halide CsPbX 3 -based perovskite solar cells (PeSCs) are emerging as one of the most promising types of PeSCs on account of their thermostability compared to organic–inorganic hybrid counterparts. However, dissatisfactory device performance and high processing temperature impede their development for viable applications. Herein, a facile route is presented for tuning the energy levels and electrical properties of sol–gel-derived ZnO electron transport material (ETM) via the doping of a classical alkali metal carbonate Cs 2 CO 3 . Compared to bare ZnO, Cs 2 CO 3 -doped ZnO possesses more favorable interface energetics in contact with the CsPbI 2 Br perovskite layer, which can reduce the ohmic loss to a negligible level. The optimized PeSCs achieve an improved open-circuit voltage of 1.28 V, together with an increase in fill factor and short-circuit current. The optimized power conversion efficiencies of 16.42% and 14.82% are realized on rigid glass substrate and flexible plastic substrate, respectively. A high thermostability can be simultaneously obtained via defect passivation at the Cs 2 CO 3 -doped ZnO/CsPbI 2 Br interface, and 81% of the initial efficiency is retained after aging for 200 h at 85 °C.
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 12
·1909972
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IF 16.836
Yu Han,Huan Zhao,Chenyang Duan,Shaomin Yang,Zhou Yang,Zhike Liu,Shengzhong (Frank) Liu
Cesium-based inorganic perovskites, such as CsPbI 2 Br, are promising candidates for photovoltaic applications owing to their exceptional optoelectronic properties and outstanding thermal stability. However, the power conversion efficiency of CsPbI 2 Br perovskite solar cells (PSCs) is still lower than those of hybrid PSCs and inorganic CsPbI 3 PSCs. In this work, passivation and n-type doping by adding CaCl 2 to CsPbI 2 Br is demonstrated. The crystallinity of the CsPbI 2 Br perovskite film is enhanced, and the trap density is suppressed after adding CaCl 2 . In addition, the Fermi level of the CsPbI 2 Br is changed by the added CaCl 2 to show heavy n-type doping. As a result, the optimized CsPbI 2 Br PSC shows a highest open circuit voltage of 1.32 V and a record efficiency of 16.79%. Meanwhile, high air stability is demonstrated for a CsPbI 2 Br PSC with 90% of the initial efficiency remaining after more than 1000 h aging in air.
研究领域:
材料科学
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光伏技术
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能源研究
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
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2022
·
IF 10.508
Fu Zhang,Xiaoran Sun,Haonan Xie,Xudong Cai,Bolin Zheng,Hua Yu,Enzuo Liu,Xiaojing Hao,Meng Zhang
Despite the remarkable advances of inorganic perovskite solar cells (PSCs) by extrinsic metal doping, the doping mechanism and physical location of doping ions are still ambiguous. Herein, the ion-migration behavior of inorganic PSCs is studied theoretically and experimentally for Sm-doped CsPbI2Br perovskites. The structural characterizations and density functional theory (DFT) calculation confirm the interstitial occupancy of the dopant Sm in the CsPbI2Br perovskite lattice. The ion-migration behavior was systematically unveiled by employing multiple photoelectrochemical techniques. The results show that with Sm interstitial doping in the CsPbI2Br perovskite, the operational stability of PSCs is dramatically improved owing to effectively suppressed ion migration, demonstrated by alleviated VOC change at different scan rates, weaker response to electric poling, faster photocurrent response, higher activation energy of mobile ions, and much more stable maximum power point (MPP) tracking performance. With theoretical model-supported experimental investigation, this research unravels the mechanism of ion-migration suppression in CsPbI2Br PSCs by interstitial doping. This may pave the way to achieve operational stability of PSCs through facile cost-effective practice.
研究领域:
材料科学
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光伏技术
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Xianghua Yao,Xinyu Tang,Mengwei Wu,Ze Wang,Haoqiang Zhang,Haoyu Wang,Haotian Wang,Haolin Zhang,Furong Wang,Yonghao Zheng,Peng Huang,Dongsheng Wang,Xiaodong Liu
The functional material-based interface and additive engineering are considered as valid approaches to enhance the photovoltaic performance of perovskite solar cells (PSCs). However, most of these materials have been reported to play only one role in PSCs. Herein, we applied versatile potassium acetate (KAc) as the cathode buffer layer (CBL), electron transporting layer (ETL), and perovskite additive in all-inorganic CsPbI2Br PSCs, respectively. All the KAc-incorporated devices yield higher efficiency than the control device. Especially, we achieve the interfacial and doping synergistic effects by introducing KAc CBL between SnO2 ETL and CsPbI2Br perovskite. For the interfacial effect, the KAc CBL can passivate the Sn-related defects and optimize the interfacial energy-level alignment at the SnO2/CsPbI2Br contact. For the doping effect, KAc is partially doped into CsPbI2Br during spin-coating of the perovskite precursor solution due to its good solubility in the solvent of perovskite precursor, which results in the passivation of uncoordinated Pb2+ in the perovskite layer. Owing to the interfacial and doping synergistic effect, the power conversion efficiency (PCE) increases noticeably from 12.91% to 15.71% after inserting KAc CBL. Furthermore, the device with KAc CBL exhibits superior long-term thermal stability. The findings offer a versatile material to simultaneously passivate interfacial and bulk defects and thus enhance the performance of all-inorganic PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yuzhu Li,Jiajun Yang,Lai Xie,Yu Li,Xiwen Liang,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
In this work, 4-bromoaniline (BrAL) is employed to modify the CsPbI2Br/carbon electrode interface to passivate defects of all-inorganic CsPbI2Br perovskite solar cells (PSCs). The effects of BrAL modification on the structure, light absorption, and trap-state density (Ntrap) of CsPbI2Br films and the carrier recombination process, photoelectrical characteristics, and air stability of the PSCs are systematically studied. The results show that the hydrophobic BrAL interlayer modification can lead to a better matched energy-level alignment, reduce the Ntrap to construct uniform CsPbI2Br films, and suppress carrier recombination to promote charge transport and collection. Thus, the modified PSC achieves a higher power conversion efficiency (PCE) of 11.34% with less hysteresis (reference-PSC, 9.50%) and better stability in ambient air. The BrAL passivation provides a good strategy to enhance the photoelectrical performance and air stability of all-inorganic PSCs.
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
Nano Research
·
2020
·Vol. 13
·期 3
·684-690
·
IF 8.183
Wei Jing,Wang Xi,Sun Xiangyu,Yang Zhaofeng,Moreels Iwan,Xu Kun,Li Hongbo
Inorganic halide perovskites such as cesium lead iodide (CsPbI 3 ) have drawn tremendous attention, as their tunable band gaps are desirable for solar cells as well as light emitting diodes. However, due to their low Goldschmidt tolerance factor, the cubic phase of bulk CsPbX 3 —the variant with desirable band gap—is not stable in ambient, especially in humid air. Besides, the low solubility of CsX in precursor makes it difficult to control the film thickness and morphology of CsPbX 3 , which becomes another obstacle for the practical application of inorganic perovskite. Here, we report a polymer assisted deposition of high-quality CsPbI 2 Br film by spin-coating a polymer-blended CsPbI 2 Br precursor. The long-chained polymer increases the viscosity of the solution, which enables us to achieve a ca. 700-nm thick film with a low solution concentration of CsPbI 2 Br. Moreover, the polymer network helps to regulate the crystallization process and provides more crystallization sites for perovskite film, reducing grain size and thus improving the film coverage. Perovskite solar cells with the polymer network exhibit improved efficiency and reproducibility (0.72% standard deviation). Moreover, the device demonstrates excellent robustness against moisture and oxygen, and maintains 90% of its initial power conversion efficiency (PCEs) after aging 4 months in ambient conditions. The conception of polymer incorporation into inorganic perovskite films paves a way to further increase the performance, stability and reproducibility of inorganic perovskite devices.
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
MOLECULES
·
2021
·Vol. 26
·期 11
·3398
·
IF 4.412
Yi Long,Kun Liu,Yongli Zhang,Wenzhe Li
Inorganic cesium lead halide perovskites, as alternative light absorbers for organic–inorganic hybrid perovskite solar cells, have attracted more and more attention due to their superb thermal stability for photovoltaic applications. However, the humid air instability of CsPbI2Br perovskite solar cells (PSCs) hinders their further development. The optoelectronic properties of CsPbI2Br films are closely related to the quality of films, so preparing high-quality perovskite films is crucial for fabricating high-performance PSCs. For the first time, we demonstrate that the regulation of ambient temperature of the dry air in the glovebox is able to control the growth of CsPbI2Br crystals and further optimize the morphology of CsPbI2Br film. Through controlling the ambient air temperature assisted crystallization, high-quality CsPbI2Br films are obtained, with advantages such as larger crystalline grains, negligible crystal boundaries, absence of pinholes, lower defect density, and faster carrier mobility. Accordingly, the PSCs based on as-prepared CsPbI2Br film achieve a power conversion efficiency of 15.5% (the maximum stabilized power output of 15.02%). Moreover, the optimized CsPbI2Br films show excellent robustness against moisture and oxygen and maintain the photovoltaic dark phase after 3 h aging in an air atmosphere at room temperature and 35% relative humidity (R.H.). In comparison, the pristine films are completely converted to the yellow phase in 1.5 h.Keywords:CsPbI2Br;perovskite solar cells;ambient air temperature assisted crystallization;film quality;photophysical properties
研究领域:
材料科学
·
光伏技术
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）