Advanced Energy Materials
·
2020
·Vol. 10
·期 22
·2000691
·
IF 25.245
Chenyang Duan,Jian Cui,Miaomiao Zhang,Yu Han,Shaomin Yang,Huan Zhao,Hongtao Bian,Jianxi Yao,Kui Zhao,Zhike Liu,Shengzhong (Frank) Liu
High temperature stable inorganic CsPbX 3 (X: I, Br, or mixed halides) perovskites with their bandgap tailored by tuning the halide composition offer promising opportunities in the design of ideal top cells for high-efficiency tandem solar cells. Unfortunately, the current high-efficiency CsPbX 3 perovskite solar cells (PSCs) are prepared in vacuum, a moisture-free glovebox or other low-humidity conditions due to their poor moisture stability. Herein, a new precursor system (HCOOCs, HPbI 3 , and HPbBr 3 ) is developed to replace the traditional precursors (CsI, PbI 2 , and PbBr 2 ) commonly used for solar cells of this type. Both the experiments and calculations reveal that a new complex (HCOOH•Cs + ) is generated in this precursor system. The new complex is not only stable against aging in humid air ambient at 91% relative humidity, but also effectively slows the perovskite crystallization, making it possible to eliminate the popular antisolvent used in the perovskite CsPbI 2 Br film deposition. The CsPbI 2 Br PSCs based on the new precursor system achieve a champion efficiency of 16.14%, the highest for inorganic PSCs prepared in ambient air conditions. Meanwhile, high air stability is demonstrated for an unencapsulated CsPbI 2 Br PSC with 92% of the original efficiency remaining after more than 800 h aging in ambient air.
研究领域:
材料科学
·
太阳能
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 5
·983-989
·
IF 7.804
Yixin Guo,Fei Zhao,Jiahua Tao,Jinchun Jiang,Jungang Zhang,Jianping Yang,Zhigao Hu,Junhao Chu
Graphical Defect passivation : All-inorganic carbon-based perovskite solar cells (PSCs), with Rb-doped CsPbI 2 Br as the absorber layer, exhibit improved efficiency and enhanced stability compared with PSCs with pristine CsPbI 2 Br owing to the effectiveness of Rb incorporation in passivating defects states. Recently, inorganic perovskite CsPbI 2 Br has gained much attention for photovoltaic applications owing to its excellent thermal stability. However, low device performance and high open-voltage loss, which are the result of its intrinsic trap states, are hindering its progress. Herein, planar CsPbI 2 Br solar cells with enhanced performance and stability were demonstrated by incorporating rubidium (Rb) cations. The Rb-doped CsPbI 2 Br film exhibited excellent crystallinity, pinhole-free surface morphology, and enhanced optical absorbance. By using low-cost carbon electrodes to replace the organic hole-transportation layer and metal electrode, an excellent efficiency of 12 % was achieved with a stabilized efficiency of over 11 % owing to the suppressed trap states and recombination in the CsPbI 2 Br film. Additionally, the annealing temperature for the Rb-doped CsPbI 2 Br film could be as low as 150 °C with a comparable high efficiency over 11 %, which is one of the best efficiencies reported for hole-transporting-layer-free all-inorganic perovskite solar cells. These results could provide new opportunities for high-performance and stable inorganic CsPbI 2 Br solar cells by employing A-site cation substitution.
研究领域:
材料科学
·
光伏技术
·
可再生能源
·
太阳能电池
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 12
·2206245
·
IF 13.3
Xiaosong Qiu,Yuan Xu,Ruoshui Li,Yu Jing,Zhongliang Yan,Fengli Liu,Liyu Wu,Yongsheng Tu,Jialiang Shi,Zhenbo Du,Jihuai Wu,Zhang Lan
In recent years, carbon-based CsPbI 2 Br perovskite solar cells (PSCs) have attracted more attention due to their low cost and good stability. However, the power conversion efficiency (PCE) of carbon-based CsPbI 2 Br PSCs is still no more than 16%, because of the defects in CsPbI 2 Br or at the interface with the electron transport layer (ETL), as well as the energy level mismatch, which lead to the loss of energy, thus limiting PCE values. Herein, a series of cadmium halides are introduced, including CdCl 2 , CdBr 2 and CdI 2 for dual direction thermal diffusion treatment. Some Cd 2+ ions thermally diffuse downward to passivate the defects inside or on the surface of SnO 2 ETL. Meanwhile, the energy level structure of SnO 2 ETL is adjusted, which is in favor of the transfer of electron carriers and blocking holes. On the other hand, part of Cd 2+ and Cl − ions thermally diffuse upward into the CsPbI 2 Br lattice to passivate crystal defects. Through dual direction thermal diffusion treatment by CdCl 2 , CdI 2 and CdBr 2 , the performance of devices has been significantly improved, and their PCE has been increased from 13.01% of the original device to 14.47%, 14.31%, and 13.46%, respectively. According to existing reports, 14.47% is one of the highest PCE of carbon-based CsPbI 2 Br PSCs with SnO 2 ETLs.
研究领域:
材料科学
·
能源技术
✓ 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhenbo Du,Ruoshui Li,Le Yang,Fengli Liu,Jianming Lin,Jihuai Wu,Zhang Lan
CsPbI 2 Br is a potential material for perovskite solar cells (PSCs) due to its better thermal stability and high efficiency. Centrifugal deposition for film formation greatly simplifies the steps of the conventional anti-solvent spin coating method, but there are still problems hindering progress, such as small grain size and poor photoelectric performance. In this work, NH 4 SCN was introduced as an additive during the preparation of heptylamine (C 7 H 17 N) stabilised CsPbI 2 Br nanoparticles (NCs) and the films were prepared by centrifugal deposition. The results show that the low melting temperature compounds which formed by thiourea from NH 4 SCN decomposition during annealing and unreacted PbX 2 would link the small grains together by melting and flowing; after PbX 2 precipitation and reaction with CsX, the grain size was significantly increased by about 95 % compared to that of the untreated film. Due to large grains, less defects and high crystallinity, the final power conversion efficiency and fill factor reached 12.25 % and 0.70, respectively.
研究领域:
材料科学
·
太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 32
·17847-17856
·
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
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·20936-20945
·
IF 2.478
Yu Jiatao,Li Wenhui,Zhang Kunming,Han Xiuxun
The CsPbI 2 Br perovskite solar cells (PSCs) based on the carbon electrodes are considered as promising photovoltaic devices with low cost and excellent thermal stability. Although the power conversion efficiency (PCE) has made remarkable progress, recombination originating from surface defect states of perovskite is still serious. In this work, CsPbI 2 Br layer was treated by n-propyltrimethoxysilane (NPTMS) before covering carbon electrode, and effects of NPTMS modification on the microstructure and optoelectronic properties of CsPbI 2 Br films were systematically studied. We found that NPTMS effectively passivated the CsPbI 2 Br surface states and inhibited nonradiative recombination via the strong coordination of O atom with the surface atoms. As a result, the power conversion efficiency of the CsPbI 2 Br perovskite solar cell increased from 8.78 to 10.22%.
研究领域:
材料科学
·
能源技术
✓ 已验证
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
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
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
·
能源技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 40
·1902279
·
IF 24.884
Huan Zhao,Yu Han,Zhuo Xu,Chenyang Duan,Shaomin Yang,Shihao Yuan,Zhou Yang,Zhike Liu,Shengzhong (Frank) Liu
The Cs-based inorganic perovskite solar cells (PSCs), such as CsPbI 2 Br, have made a striking breakthrough with power conversion efficiency (PCE) over 16% and potential to be used as top cells for tandem devices. Herein, I − is partially replaced with the acetate anion (Ac − ) in the CsPbI 2 Br framework, producing multiple benefits. The Ac − doping can change the morphology, electronic properties, and band structure of the host CsPbI 2 Br film. The obtained CsPbI 2− x Br(Ac) x perovskite films present lower trap densities, longer carrier lifetimes, and fast charge transportation compared to the host CsPbI 2 Br films. Interestingly, the CsPbI 2− x Br(Ac) x PSCs exhibit a maximum PCE of 15.56% and an ultrahigh open circuit voltage ( V oc ) of 1.30 V without sacrificing photocurrent. Notably, such a remarkable V oc is among the highest values of the previously reported CsPbI 2 Br PSCs, while the PCE far exceeds all of them. In addition, the obtained CsPbI 2− x Br(Ac) x PSCs exhibit high reproducibility and good stability. The stable CsPbI 2− x Br(Ac) x PSCs with high V oc and PCE are desirable for tandem solar cell applications.
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
ENERGY & FUELS
·
2020
·
IF 3.421
Wanxian Cai,Yanqi Lv,Koucheng Chen,Zhaobin Zhang,Yuanzeng Jin,Xingfu Zhou
Recently, carbon-based all-inorganic perovskite solar cells (PSCs) caught the attention of photovoltaic researchers due to their remarkable stability. Herein, we report a carbon-based all-inorganic CsPbI2Br PSC using TiO2 nanorod arrays (TiO2 NRAs) as an electron transporting layer. The method of using TiO2 NRAs as an electron pathway has the advantage of increasing the electron–hole separation effectively and enables a thicker active perovskite layer to obtain a stronger absorbance. In addition, a water–alcohol soluble CsCl was used to modify the interface between TiO2 NRAs and the CsPbI2Br active layer to reduce interfacial recombination of charge carriers in the cells, and the CsCl interface-modified device showed a 10.6% increase in the open-circuit voltage. An optimized power conversion efficiency of 11.45% has been obtained, which is one of the superior performances reported for the carbon-based pure CsPbI2Br PSCs to date.
研究领域:
材料科学
·
能源研究
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Xinyu Xu,Wancheng Qin,Shanjing Liu,Chuwu Xing,Guanming Ge,Duofa Wang,Tianjin Zhang
All-inorganic perovskite solar cells require high-temperature preparation processes, which severely hinders their further commercial development. Inorganic perovskite materials have a high crystallization barrier, so the crystallinity is poor under low temperature conditions, resulting in poor device performance. Therefore, it is an important challenge to develop an excellent low-temperature preparation process. In this paper, the crystallization kinetics of the CsPbI 2 Br perovskite film under low temperature conditions was studied, and it was found that the perovskite was not completely crystallized during low temperature crystallization , and PbI 2 remained. The PbI 2 residue not only caused the appearance of lead defects but also formed insoluble CsBr due to the insufficient reaction of the raw materials. Through the interaction between the organic molecules 3-Amino-3-(3-pyridyl)propionic Acid (PA) and PbI 2 , the crystallization reaction process can be effectively improved. Eliminating the residual PbI 2 also effectively inhibited the precipitation of CsBr, thereby significantly improved the crystallinity of CsPbI 2 Br. Efficiencies of 10.95% are achieved for low-temperature-processed CsPbI 2 Br planar-architecture FTO/SnO 2 /CsPbI 2 Br/carbon, and the obtained device also showed good stability in the air.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
化学工程
✓ 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）