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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hui Li,Xiaotao Hao,Bohong Chang,Zihao Li,Lian Wang,Lu Pan,Xihan Chen,Longwei Yin
Inorganic CsPbI2Br perovskites have witnessed incredible advances as a promising representative for translucent and tandem solar cells, but unfortunately, they are still plagued by serious energy losses and undesired phase instability. Herein, a new type of π-conjugated small molecule of 4-guanidinobenzoic-acid-hydrochloride (4-GBACl) is demonstrated to effectively cross-link the Pb-X framework of perovskites. The strong coordination between 4-GBACl and the [PbX6]4– octahedron of perovskites effectively stiffens the Pb-X framework to suppress the ion migration, thus stabilizing the perovskite phase structure against light and thermal conditions. Apart from the physical barrier for phase instability resulting from the hydrophobic benzene ring at grain boundaries (GBs), guanidinium cations and −COOH and Cl– groups can simultaneously afford the passivation of positively and negatively charged defects at the GBs and surface, including undercoordinated halide species and undercoordinated Pb2+ ions, thereby effectively inhibiting the charge trapping/recombination centers. Two-dimensional confocal-fluorescence mapping images provide a visualized sight into the significantly suppressed nonradiative recombination and the prolonged carrier lifetime. It is suggested that the 4-GBACl additive plays multiple roles in grain cross-linking to regulate crystallization, distinctly reducing the trap-state density, ion migration inhibition, and moisture barrier in CsPbI2Br films. Consequently, the 4-GBACl-treated device exhibits a champion power conversion efficiency (PCE) of 15.59% accompanied with a considerably improved Voc of 1.28 V and maintains 88% of the initial PCE value after 1200 h aging under 20% relative humidity.
研究领域:
材料科学
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太阳能电池研究
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
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IF 8.1
Yaping Zhang,Yanan Wang,Jing Chen,Lin Peng,Xiaolin Liu,Jia Lin
Inorganic CsPbI 2 Br perovskite solar cells (PSCs) have attracted enormous interest due to their excellent thermal stability and immense potential for application in tandem solar cells. However, the rambunctious crystallization and poor film quality of inorganic CsPbI 2 Br perovskite are the main factors limiting their performance improvement. Herein, dibenzoylmethane (DBM), containing electron-rich and dual C O functional groups, as an efficient precursor additive, is first introduced to regulate the crystallization of CsPbI 2 Br perovskite while passivating its associated defects. After DBM modification, nucleation is accelerated and the crystallinity of CsPbI 2 Br film is improved, thus promoting the phase stability. Additionally, DBM can passivate uncoordinated Pb 2+ defects, thereby significantly reducing non-radiative recombination, and can also decrease the energy level difference between CsPbI 2 Br/Carbon. As a result, when DBM additive is incorporated in the CsPbI 2 Br, the power conversion efficiency (PCE) of the device with the fluorine doped tin oxide glass (FTO)/SnO 2 /CsPbI 2 Br/Carbon structure is significantly improved to 13.46 %, an increase of nearly 13 % compared to the control device (11.72 %). The unpackaged devices exhibit excellent air and thermal stability, still remaining over 90 % of its initial PCE after aging for 500 h under ambient conditions, or continuous heating at 65 °C in glovebox for 500 h, respectively.
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
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
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Mingzhe Zhang,Wenhui Li,Wenning Zhao,Xiuxun Han
The carbon-electrode-based CsPbI2Br perovskite solar cells (C-PSCs) are promising photovoltaic technology because of their enhanced stability and low cost. However, the CsPbI2Br film suffers from uneven surface morphology with stripes and the defect-rich surface, which are detrimental to the charge carrier transport between perovskite and carbon. Here, we demonstrate that the formation of stripes is directly related to the I/Br homogenization process during annealing. By introducing a pre-annealing treatment before high temperature annealing, the I/Br homogenization process is modulated and the stripe is successfully wiped off. Besides, enhanced charge carrier transport in the C-PSCs is achieved. Oleic acid (OA) is then introduced to modify the stripe-free perovskite film surface. It is revealed that the carboxyl group in the OA molecule can passivate the undercoordinated Pb ions, leading to further improved charge carrier transport. Eventually, a power conversion efficiency (PCE) of 15.57% is achieved, which is among the highest PCE for the CsPbX3-based C-PSCs. This work demonstrates that combining surface planarization with surface passivation is an effective strategy for developing highly efficient C-PSCs.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Zijun Niu,Weifeng Liu,Kexiang Wang,Weiwei Sun,Xiaonan Huo,Yanqin Miao,Tingting You,Penggang Yin
Inorganic CsPbI2Br carbon-based perovskite solar cells (C-PSCs) are considered as an alternative promising contender in the field of photovoltaics, attributed to their remarkable thermal stability and cost-effectiveness. However, the defects located at the electron transporting layer (ETL)/perovskite interface (i.e., buried interface) and unsatisfactory crystallinity of CsPbI2Br films hinder the progress in enhancing the power conversion efficiency (PCE). Herein, we put forward facile acetate-assisted buried interface engineering to passivate TiO2/perovskite interface defects along with regulate the crystallization process of CsPbI2Br. Multifunctional small molecule interface modifier zinc acetate (Zn(Ac)2) is introduced into the surface of TiO2 ETL, which can passivate the oxygen vacancy defects of TiO2 and optimize the energy level alignment at the TiO2/CsPbI2Br interface. Meanwhile, part of Ac– may be dissolved in the CsPbI2Br precursor to retard its nucleation process, leading to enhanced crystallinity with a larger grain size of the CsPbI2Br film. As a result, reduced interface defects and bulk defects as well as enhanced electron extraction are achieved, which substantially enhance the PCE of CsPbI2Br C-PSCs from 12.54% to 14.20%, among the highest values of this type of device. Besides, thermal and long-term storage stabilities of the optimized devices are improved.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Wenjing Su,Xiaopeng Han,Jianyong Feng,Zhi Zhu,Huiting Huang,Jincheng Li,Tao Yu,Zhaosheng Li,Zhigang Zou
All-inorganic CsPbI2Br perovskite films offer attractive thermal stability and photophysical properties for high-performance optoelectronic devices. However, due to the rapid evaporation rate of the solvent, there are many defects, heterogeneous compositions, and pinholes in the CsPbI2Br films prepared by the common solution method. Herein, the homogeneous cap-mediated annealing strategy is successfully introduced to slow down the evaporation rate of the residual dimethyl sulfoxide solvent molecules in CsPbI2Br precursor films during thermal annealing. Compared with the conventional annealing method, the CsPbI2Br films prepared by the homogeneous cap-mediated annealing have excellent crystallinity with a pinhole-free surface. As a result, the perovskite solar cells based on the homogeneous cap-mediated annealing CsPbI2Br and carbon top electrode exhibited a power conversion efficiency (PCE) of 11.24%, which is much higher than that (4.36%) of the conventional annealing CsPbI2Br-based solar cells. Moreover, the homogeneous cap-mediated annealing strategy can also be introduced to a two-step annealing method. Because of the synergistic effect, the high-quality CsPbI2Br perovskite films with a low root-mean-square of 19.53 nm, enlarged grain size, and reduced defect density are obtained, and the champion PCE of the solar cells is further increased to 12.82%.
研究领域:
材料科学
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光伏技术
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengen Ma,Yilin Zeng,Yuzhao Yang,Cuiling Zhang,Yujiao Ma,Shaohang Wu,Chong Liu,Yaohua Mai
The wide-band-gap inorganic CsPbI2Br perovskite material provides a highly matched absorption range with the indoor light spectrum and is expected to be used in the fabrication of highly efficient indoor photovoltaic cells (IPVs) and self-powered low-power Internet of Things (IoT) sensors. However, the defects that cause nonradiative recombination and ion migration are assumed to form leakage loss channels, resulting in a severe impact on the open-circuit voltage (VOC) and the fill factor (FF) of IPVs. Herein, we introduce poly(amidoamine) (PAMAM) dendrimers with multiple passivation sites to fully repair the leakage channels in the devices, taking into account the characteristics of IPVs that are extremely sensitive to nonradiative recombination and shunt resistance. The as-optimized IPVs demonstrate a promising PCE of 35.71% under a fluorescent light source (1000 lux), with VOC increased from 0.99 to 1.06 V and FF improved from 75.21 to 84.39%. The present work provides insight into the photovoltaic mechanism of perovskites under full sun and indoor light, which provides guidance for perovskite photovoltaic technology with industrialization prospects.
研究领域:
材料科学
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能源技术
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光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Micro and Nanostructures
·
2024
·
IF 2.7
Lei He,Min Zhong
In this study, by adding Polyethylene-graft-maleic anhydride (PGMA) to the inorganic CsPbI 2 Br perovskite film, the coordination bonds and hydrogen bonds between PGMA and CsPbI 2 Br cooperate to passivate defects, regulate energy level and stabilize the perovskite structure and eventually improve the device performance. We systematically study the effects of PGMA addition on the morphology, structure, light absorption, defect concentration and carrier lifetime, hydrophobicity , and optical stability and room temperature black phase stability of CsPbI 2 Br films, and the photoelectric performance and air stability of PSCs , as well as their mechanism. The experimental results show that the addition of 3 wt% of PGMA greatly improves the photoelectric conversion efficiency (PCE) of CsPbI 2 Br PSCs by 40.19 % because of the synergistic passivation effects and energy level tuning. The hydrogen bonds between –CH 2 in PGMA and I − /Br − in CsPbI 2 Br, along with the coordination of carbonyl groups with Cs + /Pb 2+ , improve carrier transport and collection by inactivating flaw and managing the level, reducing the non-radiative recombination losses. In addition, the PSCs with 3 wt% of PGMA maintain 80 % of their initial efficiency even after 600 h in high humidity air environment due to the synergistic effect of coordination bonds and hydrogen bonds. Our study provides valuable insights into the use of PGMA to improve the performance of all-inorganic CsPbI 2 Br PSCs and the practicality of perovskite solar cells.
研究领域:
材料科学
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能源技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shiqiang Fu,Jiahao Wang,Xiaohui Liu,Haobo Yuan,Zuxiong Xu,Yongjin Long,Jing Zhang,Like Huang,Ziyang Hu,Yuejin Zhu
CsPbI 2 Br all-inorganic perovskite has attracted considerable attention due to its high thermal stability and suitable bandgap, while the unsatisfactory crystallization quality and moisture instability significantly hinder its further application. Herein, a novel multifunctional liquid additive, 2-hydroxyethyl methacrylate (HEMA), is introduced into the CsPbI 2 Br precursor to ameliorate the above issues. Our results demonstrate that the functional groups of HEMA can interact with perovskite precursor, thus improving crystallization and passivating defects at the same time, and leading to a champion power conversion efficiency of up to 16.13%. Importantly, HEMA molecule in perovskite films will polymerize to a hydrophobic polymer at grain boundaries through breaking C = C bonds during the high temperature annealing process (160 °C). Moreover, this multifunctional liquid additive strategy endows perovskite films with promoted moisture tolerance by crosslinking perovskite grains and blocking moisture penetration, thus the unencapsulated device maintains 78% of its initial efficiency after aging at 30% relative humidity for 1000 h. These results demonstrate that the additive engineering with multifunctional molecule is applicable strategy for developing CsPbI 2 Br all-inorganic perovskite solar cells with both high efficiency and stability.
研究领域:
材料科学
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太阳能电池技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 32
·17847-17856
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IF 3.43
Kaiyuan Wang,Jiyu Zhou,Xing Li,Nafees Ahmad,Haoran Xia,Guangbao Wu,Xuning Zhang,Boxing Wang,Dongyang Zhang,Yu Zou,Huiqiong Zhou,Yuan Zhang
All-inorganic perovskite solar cells (PSCs) are attracting considerable attention due to their promising thermal stability, but their inferior power-conversion efficiencies (PCE) hinder their realistic application. Here, we propose an approach through surface modification based on methyl ammonium halide (MAX) for inorganic CsPbI2Br solar cells processed at a low temperature. The combined benefits of the introduced MAX modifier enable the boosting of the power conversion efficiency to 14.8% with an impressive FF of 82.2% in CsPbI2Br PSCs. Our experimental analyses coupled with optical modeling indicate that the incorporated MAX leads to an effective passivation of the surface traps originating from Pb2+ and I− ions in CsPbI2Br and simultaneously mediates the crystallization of CsPbI2Br with slightly enlarged grains and reduced numbers of structural defects and pinhole. As a result, the interfacial trap-assisted recombination is suppressed and the charge extraction is promoted. Mechanistically, we show that in the presence of MAX, the deep-level traps in the perovskites are passivated, leaving the energy of the trapping centers to become shallower. In this situation, the negative impacts of the traps on carrier transport and recombination are mitigated.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Chen Wang,Boxue Zhang,Xiaohui Ma,Liqun Yang,Xueni Shang,Cong Chen
CsPbI 2 Br perovskite is a promising candidate for highly efficient photoactive materials. We firstly introduced an organic ionic plastic crystals additive, 1,1′-Spirobipyrrolidinium hexafluoride (SBP + PF 6 − ), to increase the power conversion efficiency and improve the stability by adjusting the crystallization of the CsPbI 2 Br perovskite light-absorbing layer and passivating the pinhole defects at the grain boundary. The detailed results reveal that PF 6 − molecular anions can fill the vacancy in the X-site and passivate the interface defects. Moreover, SBP + with high conductivity can be used to regulate A-site defects. The results show that the SBP + PF 6 − modified device exhibits a champion efficiency of 13.20%, enhanced by 19% than that of the control device. This work proposes not only a straightforward strategy to control the crystallization process in CsPbI 2 Br perovskite-based solar cells but also the functionality of organic ionic plastic crystals additive for chemical bonding and defects passivation to improve efficiency and stability.
研究领域:
材料科学
·
可再生能源
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）