Aoxi He

Sichuan University

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i-10 index

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Co-Authors

Xia Hao

Sichuan University

Lili Wu

Fujian Medical University

Peng Tang

Chengdu Medical College

Jingquan Zhang

South China Normal University

Yunfan Wang

Wuhan University of Technology

Zhuoqiong Zhang

Hong Kong Polytechnic University

Sai‐Wing Tsang

City University of Hong Kong

Yuxuan Zhang

City University of Hong Kong

Zixin Zeng

City University of Hong Kong

Dewei Zhao

Sichuan University

Cooperative Institutions

Sichuan University

Chinese Academy of Sciences

University of Electronic Science and Technology of China

Ministry of Education of the People's Republic of China

City University of Hong Kong

Chengdu University

Peking University

University of Chinese Academy of Sciences

Kowloon Hospital

Jilin University

Author Statistics

Papers

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π-π stacking small molecule enable high performance perovskite solar cells

Journal of Materials Chemistry A (2024)

Aoxi He Meng Wang Xiaoli Gong Peng Tang Lili Wu

By introducing bromobenzoic acid (BAC) into the perovskite precursor solution, the micro-strain in the perovskite film was effectively relieved. This additive improved the PCE to 24.02% ultimately.

10.1039/d3ta07997j

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Tailoring buried interface of tin oxide-based n-i-p perovskite solar cells via bidirectional and multifunctional metal ion chelating agent modification

Journal of Materials Chemistry A (2023)

Meng Wang Aoxi He Lili Wu Xia Hao Gengpei Xia

For the n-i-p perovskite solar cells hiring tin oxide (SnO 2 ) as electron transporting material, the buried interface (SnO 2 /perovskite interface) acts as the working interface and growth substrate of the perovskite crystal simultaneously.

Tin oxide

Interface (matter)

Crystal (programming language)

10.1039/d3ta02983b

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Citations (3)

Doping Modification of Cs₃Bi₂I₉ Single Crystals for High‐Performance X‐Ray Detectors

physica status solidi (RRL) - Rapid Research Letters (2023)

Anfeng Li Manman Yang Aoxi He Peng Tang Xia Hao

Cs 3 Bi 2 I 9 (CBI) is a promising material for direct X‐ray detectors. However, for the solution method, due to the difference in the chemical potential of Cs + , Bi 3+ , I − ions in the solvent, the composition of CBI single crystals (SCs) prepared by the solution method often deviates from the stoichiometric ratio, resulting in the formation of many defects in the material, which degrades the quality of the SC. Herein, Br − and Cl − are used as dopants to produce CBI SCs by the top seed solution method. It can be speculated that the dopant ions can reduce the V I defects in the CBI by means of density functional theory calculations. The carrier lifetimes of CBI SCs doped with Br − and Cl − have been increased to 41.7 and 13.0 ns, respectively. Meanwhile, the defect densities of the SCs are reduced to 1.02 × 10 9 and 1.85 × 10 9 cm −3 , respectively. X‐ray detectors based on Br‐doped CBI and Cl‐doped CBI SCs exhibit high X‐ray sensitivity of 23071.3 and 18525.3 μC Gy air −1 cm −2 at an electric field of 40 V mm −1 , respectively. In addition, the X‐ray detection limit reaches 1.07 and 1.35 nGy air s −1 at an electric field of 2.5 V mm −1 , respectively.

Stoichiometry

10.1002/pssr.202300306

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Unraveling the Impact of Bromine Incorporation on the Hybrid Perovskite Film Phase Evolution Mechanism by In Situ Characterization (Adv. Energy Mater. 39/2023)

Advanced Energy Materials (2023)

Aoxi He Yunfan Wang Peng Tang Zhuoqiong Zhang Zixin Zeng

Perovskite Films In article number 2300957, Jingquan Zhang and co-workers report the dependence of film phase on the bromine content in anti-solvent assisted spin coating technology. The incorporation of bromine promotes the 3C phase formation significantly by reducing the energy barrier from the 2H to the 3C phase. The results have significant potential value for improving efficiency of small area devices as well as large area modules.

Characterization

Spin Coating

10.1002/aenm.202370161

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Prospect of SnO2 Electron Transport Layer Deposited by Ultrasonic Spraying

Energies (2022)

Long Wu Aoxi He Shenghui Xie Xiutao Yang Lili Wu

The SnO2 electron transport layer (ETL) has been characterized as being excellent in optical and electrical properties, ensuring its indispensable role in perovskite solar cells (PSCs). In this work, SnO2 films were prepared using two approaches, namely, the ultrasonic spraying method and the traditional spin-coating, where the different properties in optical and electrical performance of SnO2 films from two methods were analyzed by UV–Vis, XRD, AFM, and XPS. Results indicate that the optical band gaps of the sprayed and the spin-coated film are 3.83 eV and 3.77 eV, respectively. The sprayed SnO2 film has relatively low surface roughness according to the AFM. XPS spectra show that the sprayed SnO2 film has a higher proportion of Sn2+ and thus corresponds to higher carrier concentration than spin-coated one. Hall effect measurement demonstrates that the carrier concentration of the sprayed film is 1.0 × 1014 cm−3, which is slightly higher than that of the spin-coated film. In addition, the best PCSs efficiencies prepared by sprayed and spin-coated SnO2 films are 18.3% and 17.5%, respectively. This work suggests that the ultrasonic spraying method has greater development potential in the field of flexible perovskite cells due to its feasibility of large-area deposition.

Spin Coating

Deposition

10.3390/en15093211

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Citations (6)

Macroscopic and microscopic defect management in blue/green photodetectors for underwater wireless optical communication

Journal of Materials Chemistry C (2022)

Xiangyu Zhou Lingzhi Luo Yixuan Huang Shunyong Wei Jihua Zou

A strategy that decorates perovskite films with bromide-terminated MXene nanoparticles has been proposed for a retarded crystal nucleation process and improved atomic interaction. This approach leads to reduced structural defects and enhanced carrier transport.

Crystal (programming language)

10.1039/d2tc00097k

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Chlorobenzene solvent annealing of perovskite thin films for improving efficiency and reproducibility of perovskite solar cells

Journal of Materials Science Materials in Electronics (2022)

Yidie Yuan Aoxi He Xia Hao Hongyu Li Dewei Zhao

Chlorobenzene

Perovskite solar cell

10.1007/s10854-022-09122-8

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DL‐Serine Hydrazide Hydrochloride Multiple‐site Synergy Induced Effective and Stable Formamidine‐Rich Perovskite Solar Cells

Small (2024)

Xiaoli Gong Aoxi He Peng Tang Xia Hao Lili Wu

Abstract The efficiency and stability of solar cells are two key indicators that determine for the commercial feasibility of photovoltaic devices. Formamidine‐cesium perovskite has been extensively investigated since its excellent thermal stability and has great potential in achieving high power conversion efficiency. However, during the aging process, especially under light conditions, formamidine‐rich perovskites are prone to produce iodine, and the escape of iodine is one of the important factors leading to device degradation. Here, DL‐Serine Hydrazide Hydrochloride containing the reducing group is introduced into the precursor solution of formamidine‐cesium perovskite, which achieves multiple‐site passivation. Hydrazine reacts with iodine to reduce it to iodine ions, inhibiting the escape of iodine. In addition, carbonyl groups and uncoordinated lead ions form coordination bonds to reduce defects. In the end, the perovskite solar cell with DL‐Serine Hydrazide Hydrochloride added achieves a champion efficiency of 22.22%, and maintains 85.88% of the initial efficiency after continuous exposure under 1 sun for 7000 s at a relative humidity of ≈40%. Additionally, DL‐Serine Hydrazide Hydrochloride added device shows good stability in air environments with relative humidity of 50%–60%. DL‐Serine Hydrazide Hydrochloride improves the stability of formamidine‐rich perovskite solar cells and provides a low‐cost strategy for commercial development.

Hydrochloride

10.1002/smll.202401877

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Citations (1)

Unraveling the Impact of Bromine Incorporation on the Hybrid Perovskite Film Phase Evolution Mechanism by In Situ Characterization

Advanced Energy Materials (2023)

Aoxi He Yunfan Wang Peng Tang Zhuoqiong Zhang Zixin Zeng

Abstract Hybrid organic‐inorganic perovskite materials have substantially boosted solar cell efficiency, but such multiple components complicate the crystallization kinetics and phase evolution process. In particular, the mechanisms underlying the film formation where small halide Br − is involved in, from precursor to solid‐state thin films as well as the process‐structure relationship, still need to be determined. In this study, the role of Br − ion in altering the crystallization kinetics and phase‐transition mechanism, is recognized using in situ characterization and density functional analysis method based on first principles. High‐quality perovskite film can be fabricated based on these results through precise compositional engineering. These results provide basic insight into the crystallization of hybrid perovskite materials with direct implications for fabricating high‐quality perovskite film and high‐performance perovskite solar cells.

Characterization

10.1002/aenm.202300957

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Citations (14)

Unlocking the Ambient Temperature Effect on FA‐Based Perovskites Crystallization by In Situ Optical Method

Advanced Materials (2023)

Yunfan Wang Zixin Zeng Yuxuan Zhang Zhuoqiong Zhang Le‐Yu Bi

Multiple cation-composited perovskites are demonstrated as a promising approach to improving the performance and stability of perovskite solar cells (PSCs). However, recipes developed for fabricating high-performance perovskites in laboratories are always not transferable in large-scale production, as perovskite crystallization is highly sensitive to processing conditions. Here, using an in situ optical method, the ambient temperature effect on the crystallization process in multiple cation-composited perovskites is investigated. It is found that the typical solvent-coordinated intermediate phase in methylammonium lead iodide (MAPbI

Formamidinium

Spin Coating

10.1002/adma.202307635

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Citations (30)