APPLIED SURFACE SCIENCE
·
2025
·
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
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Shenshen Zheng,Haobin Wang,Peng Wei,Huamei Chen,Yahong Xie
All-inorganic carbon-based perovskite solar cells (C-PSCs) with CsPbI 2 Br as photosensitizer have attracted great attention due to their low cost, high efficiency, and good stability. However, the CsPbI 2 Br film prepared by the solution method usually has many defects, which reduces the charge extraction rate and photoelectric performance. In this paper, intermediate gradient annealing and antisolvent ethyl acetate treatment are combined to prepare CsPbI 2 Br films with good crystallinity and few voids. The surface of the obtained CsPbI 2 Br film is then treated using tetrabutylammonium iodide (TBAI), which can interact with the Pb-I framework to passivate defect states and extend the carrier lifetime. Finally, the champion power conversion efficiency (PCE) of the optimized C-PSCs with a structure of FTO/SnO 2 /CsPbI 2 Br/carbon electrode prepared in the air reach 12.29%. At the same time, TBAI molecules also effectively enhance the stability of the PSCs, and the unencapsulated device can still maintain 90% of the initial efficiency after 300 h of storage in an ambient air atmosphere with a relative humidity of 20%-30%. This work provides a simple and effective strategy for the preparation of cheap, high-performance, and stable all-inorganic C-PSCs under atmospheric conditions, and also increases the feasibility of PSCs commercialization.
研究领域:
材料科学
·
能源技术
✓ 已验证
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
Surfaces and Interfaces
·
2020
·
IF 3.724
Caiyun Zhang,Xiaojing Wan,Jiadong Zang,Qi Liu,Yuemeng Fei,Ze Yu
All-inorganic CsPbI 2 Br perovskite with relatively high phase stability and a suitable band gap has been considered as a promising candidate for photovoltaic application. However, in comparison with its organic–inorganic counterparts, it still shows unsatisfactory efficiency and high moisture sensitivity. Here, polyethylene glycol (PEG) is introduced into the CsPbI 2 Br precursor solution. It is revealed that Lewis base PEG interacts with Pb 2+ , which can slow down the crystallization rate, regulate the energy levels, and passivate the defect density of CsPbI 2 Br films. As a result, the optimized devices with PEG exhibit a power conversion efficiency (PCE) of 13.59% under one sun illumination (100 mW cm ‒2 ), which is considerably higher than that of the control devices (10.09%), owing to the reduced nonradiative recombination losses for the former CsPbI 2 Br films. The results demonstrate that using polymer additives to improve the device performance is an effective strategy for all-inorganic perovskite solar cells.
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
SOLAR ENERGY
·
2021
·
IF 5.742
Jixi Wang,Yangbiao Liu,Xiudi Xiao,Zhuoneng Bi,Yuan Lu,Guizhang Sheng,Xuesong Cai,Yanqing Zhu,Xueqing Xu,Gang Xu
All inorganic perovskite solar cells (PSCs) have been demonstrated to get tremendous interest recently owing to their better thermal stability. Nevertheless, some CsPbI 2 Br films prepared at low temperature have lower quality compared to those annealing at high temperature. Herein, to obtain high performance PSCs, a simple post-treatment strategy is presented by spin coating acetylacetone (AA) solution on the CsPbI 2 Br films. The AA treatment can reduce the density traps on the CsPbI 2 Br films surface and enlarge the size of grains, resulting in enhanced performance PSCs. After optimizing surface treatment, the devices based on low-temperature-processed CsPbI 2 Br with AA treatment achieved a power conversion efficiency (PCE) of 14.43%. The better CsPbI 2 Br films quality and interface contact of hole transport layer (HTL)/CsPbI 2 Br result in better device stability. Therefore, it could be a promising post treatment method for enhancing the performance of PSCs by introducing AA on the perovskite surface.
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
ACS Applied Energy Materials
·
2021
·
IF 6.024
Kexiang Wang,Tingting You,Ran Yin,Bingbing Fan,Jingwen Liu,Shuang Cui,Haining Chen,Penggang Yin
Carbon-based all-inorganic CsPbI2Br perovskite solar cells (C-PSCs) are regarded as a promising photovoltaic candidate due to their low cost, simple device structure, and high stability. However, their power conversion efficiency (PCE) is still too poor for commercial applications, mainly due to the lack of thick and high-quality CsPbI2Br films with less defects. In this work, three antisolvents are chosen to finely control the crystallization process of the CsPbI2Br film based on pure dimethyl sulfoxide solvent; a 500 nm-thick CsPbI2Br film is fabricated using isopropanol as an antisolvent. Furthermore, excess PbI2 is introduced to not only enhance the crystallinity of the CsPbI2Br film and passivate defects located at grain boundaries but also improve the hole extraction from the n-type CsPbI2Br film to the carbon electrode. Consequently, the PCE of CsPbI2Br C-PSC is dramatically boosted up to 12.78% with small hysteresis, which is among the highest values of all-inorganic C-PSCs. Moreover, the unencapsulated C-PSC demonstrates excellent long-term thermal stability, maintaining 93% of its initial PCE after aging at 85 °C for 600 h in dry air. Our work provides significant guidance for developing low-cost, high-performance, and stable CsPbI2Br C-PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 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）