Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Jia-Cheng Wang,Wen Zeng,Chuanyao Zhou,Xueming Yang,Zefeng Ren
Organic–inorganic hybrid perovskites have garnered significant attention in the field of photovoltaics due to their exceptional optoelectronic properties. However, their sensitivity to environmental factors, such as water vapor and oxygen, remains a significant challenge to long-term stability, and the mechanisms underlying their interaction with perovskites are still not yet fully understood. This study investigates how water vapor and oxygen influence carrier dynamics in CH3NH3PbI3 perovskite films by employing a combination of high-sensitivity transient absorption spectroscopy (TAS) and time-resolved photoluminescence (TRPL). The results demonstrate that both water vapor and oxygen effectively passivate deep traps, while exhibiting inertness toward shallow traps, thus prolonging carrier lifetimes. Notably, the passivation effect induced by oxygen is nearly fully reversible, in contrast to the partially reversible effect of water vapor. Furthermore, carrier lifetimes increase monotonically with rising water vapor pressure, whereas oxygen passivation is significantly more efficient: as low as 100 ppm or even less oxygen can induce the saturation of oxygen passivation. These insights into the ambient-induced modulation of carrier recombination dynamics provide a critical foundation for developing strategies to enhance the operational stability of perovskite solar cells.
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 23
·4405-4411
·
IF 3.849
Jie Ding,Huajing Fang,Zhipeng Lian,Jiangwei Li,Qianrui Lv,Liduo Wang,Jia-Lin Sun,Qingfeng Yan
Methylammonium lead iodide perovskite (MAPbI3) has made a re-entry into the literature nowadays for its extraordinary characteristics, such as high absorption of light, long carrier diffusion length, high carrier mobility, low trap-state density, low surface recombination velocity and ease of attainment. Here, we report a self-powered photodetector based on a CH3NH3PbI3 single crystal by employing asymmetric Au–Al electrodes. The key issue of this photodetector was the metal–semiconductor contacts, owing to the Schottky junction between them. By setting the channel length between the Au–Al electrodes to 30 μm for sufficient electron–hole pair separation and transportation, the device showed good performance under 1 sun illumination. The short-circuit photocurrent density and open-circuit voltage were 6.86 mA cm−2 and 0.7 V, respectively. The photocurrent was almost 2 orders of magnitude larger than that based on a perovskite polycrystalline film with a similar device structure. More importantly, the device could detect the lowest noticeable incident power density down to 1 × 10−8 W cm−2. Under this weak light intensity, the responsivity was as high as 0.24 A W−1 without any bias. The photoresponse also had a broadband ranging from 375 nm to 808 nm accompanied by a fast response speed.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-6
·
IF 3.159
Shan Dan,Tong Guoqing,Cao Yunqing,Tang Mingjun,Xu Jun,Yu Linwei,Chen Kunji
Hybrid organic-inorganic perovskites (HOIPs) exhibit long electronic carrier diffusion length, high optical absorption coefficient, and impressive photovoltaic device performance. At the core of any optoelectronic device lie the charge transport properties, especially the microscopic mechanism of scattering, which must efficiently affect the device function. In this work, CH 3 NH 3 PbI 3 (MAPbI 3 ) films were fabricated by a vapor solution reaction method. Temperature-dependent Hall measurements were introduced to investigate the scattering mechanism in MAPbI 3 films. Two kinds of temperature-mobility behaviors were identified in different thermal treatment MAPbI 3 films, indicating different scattering mechanisms during the charge transport process in films. We found that the scattering mechanisms in MAPbI 3 films were mainly influenced by the decomposed PbI 2 components, which could be easily generated at the perovskite grain boundaries (GBs) by releasing the organic species after annealing at a proper temperature. The passivation effects of PbI 2 in MAPbI 3 films were investigated and further discussed with emphasis on the scattering mechanism in the charge transport process.
研究领域:
材料科学
·
凝聚态物理
·
半导体物理
·
光伏器件
·
纳米材料
·
表面与界面科学
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功能材料
·
电子输运
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DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Segovia Rubén,Qu Geyang,Peng Miao,Sun Xiudong,Shi Hongyan,Gao Bo
Self-assembled organic-inorganic CH 3 NH 3 PbI 3 perovskite microwires (MWs) upon humidity exposure along several weeks were investigated by photoluminescence (PL) spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD). We show that, in addition to the common perovskite decomposition into PbI 2 and the formation of a hydrated phase, humidity induced a gradual PL redshift at the initial weeks that is stabilized for longer exposure (~ 21 nm over the degradation process) and an intensity enhancement. Original perovskite Raman band and XRD reflections slightly shifted upon humidity, indicating defects formation and structure distortion of the MWs crystal lattice. By correlating the PL, Raman, and XRD results, it is believed that the redshift of the MWs PL emission was originated from the structural disorder caused by the incorporation of H 2 O molecules in the crystal lattice and radiative recombination through moisture-induced subgap trap states. Our study provides insights into the optical and structural response of organic-inorganic perovskite materials upon humidity exposure.
研究领域:
材料科学
·
光学
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DOI
高影响因子
THIN SOLID FILMS
·
2019
·
IF 1.888
Lixia Ren,Min Wang,Shuanhu Wang,Hafiz Muhammad Zeeshan,Yang Zhao,Ming Li,Hong Yan,Changle Chen,Kexin Jin
Many investigations have revealed that PbI 2 plays a passivated role to reduce the charge recombination in the perovskite films. However, due to the random distribution of PbI 2 in perovskite films, the passivation effect is blanketed to some extent. In this work, we use the argon ions bombardment to deliberately induce the PbI 2 layer at the surface of perovskite films and investigate the photoelectric performance of samples. It is found that the PbI 2 layer at the surface can passivate the defects effectively, leading to an improvement of the photoconduction by an order of magnitude as well as the responsivity by >4 times under the irradiation of 405 nm light. The bombardment provides an effective method for perovskite surface passivation and optimizing the performances of perovskite-based photoelectric devices.
研究领域:
材料科学
·
光伏学
·
半导体物理
·
表面工程
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DOI
高影响因子
Science China-Information Sciences
·
2026
·Vol. 69
·期 4
·142403
·
IF 8.1
Wang Yue,Shan Xuanyu,Wang Qiang,Wang Zewei,Liu Siyu,Liu Wei,Zheng Jiahui,Zhao Xiaoning,Wang Zhongqiang,Lin Ya,Tao Ye,Xu Haiyang,Liu Yichun
Multiple sensing and processing capabilities enable an organism to obtain comprehensive information and make real-time decisions in unstructured environments. Inspired by the biological counterpart, developing neuromorphic hardware with multimodal fusion is supposed to realize high-precision processing for complex information. In this work, we developed a visual-auditory-fused reservoir computing system by combining a CH 3 NH 3 PbI 3 nanowire/pentacene optoelectronic memristor and a sound sensor. Under the stimulation of optical/electrical signals, the CH 3 NH 3 PbI 3 nanowire-based device exhibited volatility under optical or electrical stimulation, providing an essential foundation for visual-auditory-fused reservoir computing. The motion detection function was demonstrated using synchronous visual and auditory sensory information. Compared with single sensory input, the detection accuracy increased from 51.2% to 95.5% by combining the visual and auditory modalities. The results presented in this work provide a promising strategy to develop efficient multimodal neuromorphic hardware for human-robot interactions.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhu Ma,Zheng Xiao,Weiya Zhou,Lifen Jin,Dejun Huang,Huifeng Jiang,Tian Yang,Yuchuan Liu,Yuelong Huang
The presence of grain boundaries and defects in perovskite films can be detrimental to performance of perovskite solar cells (PSCs), such as leading to nonradiative recombination and environmental instability. Additive engineering is a key tactic to control crystal growth and passivate defects of perovskite film. In this work, lead-free alkali metal additive of potassium selenocyanate (KSeCN) was firstly added in precursor solution to prepare a novel perovskite of CH 3 NH 3 PbI 3-x (SeCN) x . The SeCN − is substitute for I − to enhance structure stability, simultaneously facilitate nucleation, meanwhile, effectively increase crystalline grain size and passivate the defects. Finally, the power conversion efficiency of planar perovskite solar cells boosts from 14.34% to 18.41%, and the hysteresis reduces from 21% to 1.5%, nearly negligible. Our findings provide an avenue for crystalline regulation and defects passivation to further improve the performance of perovskite solar cells and propose a promising CH 3 NH 3 PbI 3-x (SeCN) x -based perovskite.
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DOI
高影响因子
ORGANIC ELECTRONICS
·
2015
·
IF 3.827
Xueyan Wang,Xiaodong Li,Gang Tang,Lixiao Zhao,Wenjun Zhang,Tonggang Jiu,Junfeng Fang
Hybrid organic/inorganic perovskite planar heterojunction (PHJ) solar cells are becoming one of the most competitive emerging technologies. Here, the devices (ITO/PEDOT:PSS/CH 3 NH 3 PbI 3− x Cl x /PC 60 BM/C 60 /Al) are fabricated based on solution process. A power conversion efficiency (PCE) up to 13.1% was obtained after isopropanol (IPA) solvent treatment, which was 9% improvement than that of the original devices. Photocurrent hysteresis could be reduced to a certain extent by introducing IPA treatment. Solvent treatment can remove as-grown impurities like CH 3 NH 3 I and defects formed during the device fabrication. We also demonstrated the electrical and optical properties of perovskite films were improved. The addition of IPA-treated facilitates the formation of a relatively smooth PC 60 BM films. This work provides a very simple but effective strategy to enhance the power conversion efficiency of perovskite solar cells .
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
半导体器件
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DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Daocheng Hong,Weiqing Yang,Yuxi Tian
Organometal halide perovskites have been one of the most promising alternative semiconductors in photovoltaic and light-emitting devices due to their excellent optoelectronic properties. However, the photophysical processes in these hybrid perovskites are still not fully understood. Photoluminescence (PL) of perovskite materials has been one of the most popular methods to investigate the photophysical processes in these materials. However, the PL signal only provides information of the radiative recombination of the charge carriers, which is not sufficient to understand the full picture of the photophysics. For example, both PL quenching and degradation of the materials cause decrease of PL intensity, which cannot be distinguished by PL. In this work, by simultaneously monitoring the absorption and PL of CH3NH3PbI3 perovskite during the photoexcitation with the assistance of microscopic technology, we followed the PL variation and the absorption change at the same time, allowing us to directly distinguish the PL quenching effect and structure change of the materials. These results provide us an effective way to investigate the perovskite materials from different aspects and further promote the understanding of their physical processes.
研究领域:
材料科学
·
光学
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DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Ya Xu,Jianyong Feng,Tao Yu,Jiawei Li,Xiaopeng Han,Huiting Huang,Zhaosheng Li,Zhigang Zou
It is important to change the semiconducting behaviors of CH3NH3PbI3 (MAPbI3) perovskites to meet the needs for different applications, which requires efficient strategies for Fermi level tuning in MAPbI3. Previous studies reported that the Fermi level of MAPbI3 could be down-shifted when exposed to I2 vapor; such a down-shift of the Fermi level could be rationalized by the filling of iodine vacancies (VI’s), a donor-type defect in MAPbI3. However, it is difficult to control the amount of incorporated I2 into the MAPbI3 matrix; meanwhile, MAPbI3 degradation may also occur following I2 vapor exposure. Herein, we propose a controllable and facile method for iodine manipulation and Fermi level tuning of MAPbI3, in which molecular iodine dissolved in antisolvent is applied as the iodine source. After iodine manipulation, the best-performing MAPbI3 solar cell exhibits a power conversion efficiency of 17.7%, in contrast to 15.8% on the pristine MAPbI3. Steady-state and time-resolved photoluminescence measurements indicate that iodine-modified MAPbI3 possesses reduced defect density and enhanced charge-carrier lifetimes. Photoelectron spectroscopy analyses reveal a 120 meV down-shift of the Fermi level in iodine-modified MAPbI3, as compared to the control MAPbI3.
研究领域:
材料科学
·
半导体物理
·
光电子学
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产品关联
DOI
VACUUM
·
2021
·
IF 3.627
Jianbo Wang,Yuanxiang Yin,Yingyue Wang,Kai Zhou,Yun Zhang,Peng Chen,Xiaoyan Qiu
NiO is widely applied as the hole transport layer (HTL) in the high-efficient organic-inorganic hybrid perovskite solar cells (PSCs) due to its stable optical and electrical properties, especially its energy level matches well with the perovskite . We had prepared the inverted planar CH 3 NH 3 PbI 3 PSCs with the solution-processed NiO x -HTLs, and investigated the effects of NiO x precursor solution concentrations on photovoltaic performance and air-stability of PSCs. The un-encapsulated PSCs with the optimized NiO x -0.125 HTLs exhibit a large open-circuit voltage of 1.05 V and high power conversion efficiency of 16.69%. After being exposed to the atmospheric air for 720 hours, it still keeps ∼95% of the initial open-circuit voltage and ∼75% of the initial power conversion efficiency, showing better air-stability than previous CH 3 NH 3 PbI 3 cells with the solution-processed NiO x -HTLs.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Tingting Xu,Zhi Wan,Hebing Tang,Chenhui Zhao,Shaoshen Lv,Yonghua Chen,Lixin Chen,Qiquan Qiao,Wei Huang
Additive engineering is an effective method to manipulate formation of methyl ammonium metal halide perovskite film for high performance perovskite solar cells (PSCs). In this work, carbon quantum dots (CQDs) prepared from two different carbon sources named as A-CQD and CA-CQD respectively are applied as additives into CH 3 NH 3 PbI 3 precursor solution via one-step processing. Film morphology and charge transport dynamics of perovskite films with different CQDs additives are investigated. It is found that the A-CQDs incorporated perovskite film has large grain size, excellent crystallinity, enhanced carrier transport ability and high hydrophobic surface . Carbon-based perovskite solar cell using the A-CQD additive shows increased cell performance with the maximum power conversion efficiency (PCE) of 13.28%. While, PCE of the PSCs modified by the CA-CQD additive and without additive are 7.85% and 10.50% respectively. The A-CQD additive modified PSC also presents good long-term stability and maintains more than 90% of its initial PCE after 200 h.
研究领域:
材料科学
·
可再生能源
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）