Advanced Optical Materials
·
2024
·Vol. 12
·期 32
·2401539
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IF 8
Qianjin Wang,Zhilin Xiang,Peizhi Yang,Yingkai Liu,Qiuhong Tan
Metal halide perovskites recently have emerged as a promising candidate for photodetection due to their exceptional photoelectric performance. However, the high dark current in these materials has hindered their practical application to imaging. In this study, a novel halogen-mixed CsPbIBr 2 microwire photodetector that has a remarkable reduction of dark current by over 100-fold (compared to CsPbBr 3 ), along with a substantial increase in photocurrent, which yields a significantly improved on/off ratio of 6.56 × 10 4 , is developed. More importantly, the halogen-mixed perovskite photodetector exhibits enhanced photodetection performance, including a high responsivity of 133 A W −1 and a remarkable specific detectivity of 4.02 × 10 12 Jones even under ultraweak light conditions as low as 4.5 nW cm −2 . More specifically, high-resolution images are successfully obtained under ultraweak light conditions. The combined analysis of experimental results and first-principles calculation attribute the excellent performance of the CsPbIBr₂ microwire photodetector to a significant reduction in dark current by suppressing ion migration and increasing carrier effective mass, and a remarkable increase in photocurrent resulting from reduced bandgap and enhanced light absorption, as compared to CsPbBr 3 . This research represents a significant advancement in the development of high-performance 1D perovskite-based photodetectors, with promising implications for ultra-weak light imaging applications.
研究领域:
光电子学
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材料科学
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纳米器件
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半导体物理
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生物医学成像
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Jing Yang,Yunlong Gan,Mengqi Han,Shiheng Wang,Pengwei Li,Yiqiang Zhang,Gang Li,Yanlin Song
Wide-bandgap mixed-halide perovskites, particularly CsPbIBr 2 , hold great promise for multi-junction solar cells due to their well-matched bandgap and all-inorganic material system. However, their inherent susceptibility to light-induced phase segregation (LIPS) limits efficiency and stability. In this work, we investigate the effect of three organic additives—4-cyclopentene-1,3-dione (CPD), maleimide (HPD), and 3,4-dibromo-1H-pyrrole-2,5(2H,5H)-dione (BrPD)—on LIPS in wide-bandgap CsPbIBr 2 perovskite films. The additives form various chemical interactions, including coordination bonds, hydrogen bonds, and ionic bonds, with I − and undercoordinated Pb 2+ ions, among which BrPD has the strongest interaction. This interaction regulates crystallization and improves film morphology. The BrPD-modified films have the largest grain size and the highest light stability, suppressing LIPS, enhancing carrier transfer, and improving device performance. BrPD-modified CsPbIBr 2 -based solar cells achieve a power conversion efficiency (PCE) of 11.34%, outperforming the control (8.96%) and other additives. Moreover, BrPD-modified devices show excellent stability, retaining 94% of their initial PCE after 60 min of continuous light exposure. This work highlights the potential of strategically selected organic additives to enhance the stability and performance of perovskite solar cells, offering valuable insights for the design of high-efficiency and long-lasting perovskite-based optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xingnan Qi,Jiantao Wang,Furui Tan,Chen Dong,Kong Liu,Xiaobao Li,Lisheng Zhang,Hongkai Wu,Hsing-Lin Wang,Shengchun Qu,Zhanguo Wang,Zhijie Wang
CsPbIxBry-based all-inorganic perovskite materials are a potential candidate for stable semitransparent and tandem structured photovoltaic devices. However, poor film (morphological and crystalline) quality and interfacial recombination lead consequently to a decline in the photoelectric conversion performance of the applied solar cells. In this work, we incorporated PbS quantum dots (QDs) at the interface of electron transporting layer (ETL) SnO2 and perovskite to modulate the crystallization of CsPbIBr2 and the interfacial charge dynamics in carbon-based solar cells. The as-casted PbS QDs behave as seeds for lattice-matching the epitaxial growth of pinhole-free CsPbIBr2 films. The modified films with reduced defect density exhibit facilitated carrier transfer and suppressed charge recombination at the ETL/perovskite interface, contributing to an enhanced device efficiency from 7.00 to 9.09% and increased reproducibility and ambient stability. This strategic method of QD-assisted lattice-matched epitaxial growth is promising to prepare high-quality perovskite films for efficient perovskite solar cells.
研究领域:
材料科学
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光伏技术
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纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Fangxuan Yi,Qiyao Guo,Dengduan Zheng,Rong Zhuang,Junshuai Zhang,Qunwei Tang,Jialong Duan
All-inorganic perovskite solar cells (PSCs) have shown great potential to balance the efficiency and stability of traditional organic–inorganic hybrid species. However, arising from the rapid crystal nucleation rate and soft lattice of perovskite crystals, solution-processed film fabrication technology generally leads to morphologic flaws, including defective grain boundaries (GBs) and surfaces, which in turn accelerate perovskite phase decomposition upon persistent stimuli and then reduce the photovoltaic performance of PSCs. Herein, polymeric poly(vinylpyrrolidone) (PVP) with enormous functional carbon–oxygen groups is introduced into the CsPbIBr2 precursor as a multifunctional polymer capping framework to effectively improve the film quality and heal the lattice defects (uncoordinated Pb2+). By carefully maximizing the film crystallization and grain coverage, a significantly enhanced PCE of 10.54% coupled with the remarkably enhanced stability under air (≤20% relative humidity, >99% retention for 100 days) for a carbon-electrode-based device is achieved. This work paves a comprehensive promotion strategy for the development of perovskite-based optoelectronics.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2023
·
IF 3.8
Fangxuan Yi,Qiyao Guo,Wei He,Qunwei Tang,Jialong Duan
Wide-bandgap (WBG) perovskite solar cells (PSCs) are acknowledged as promising candidates for tandem solar cells and building photovoltaics. It is well known that cesium-based all-inorganic halide WBG perovskites possess the comparable optoelectronic properties as the organic–inorganic counterparts, but exhibit superior thermal stability. Among them, CsPbIBr 2 is considered a feasible material for tandem solar cells after balancing the bandgap and stability of the inorganic perovskite. However, CsPbIBr 2 PSCs are often subjected to drastic interfacial charge recombination especially in carbon-based device structure derived from the chemical bonding defects (i.e., uncoordinated Pb 2+ ) naked on CsPbIBr 2 soft lattice, which dramatically limits overall efficiency of CsPbIBr 2 WBG PSCs. Herein, a trimethyl ammonium salt hexyltrimethylammonium bromide is presented for CsPbIBr 2 /carbon interfacial modification. Benefiting from the −N + (CH 3 ) 3 passivation effect and −C 6 H 13 hydrophobic alkyl chain, the optimal device with highly smooth morphology and sufficient charge extraction exhibits a champion power conversion efficiency of 11.24% and improved long-term stability with 99.7% and 79.7% efficiency retention under dry air atmosphere and continuous 85 °C thermal stress, indicating the valuable potential application of the lattice solidified CsPbIBr 2 WBG PSCs.
研究领域:
材料科学
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光伏技术
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太阳能
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Pengyun Liu,Xiaoqing Yang,Yonghui Chen,Huimin Xiang,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Although organic–inorganic halide perovskite solar cells (PSCs) have shown dramatically enhanced power conversion efficiencies (PCEs) in the last decade, their long-term stability is still a critical challenge for commercialization. To address this issue, tremendous research efforts have been devoted to exploring all-inorganic PSCs because of their intrinsically high structural stability. Among them, CsPbIBr2-based all-inorganic PSCs have drawn increasing attention owing to their suitable band gap and favorable stability. However, the PCEs of CsPbIBr2-based PSCs are still far from those of their organic–inorganic counterparts, thus inhibiting their practical applications. Herein, we demonstrate that by simply doping an appropriate amount of Cu2+ into a CsPbIBr2 perovskite lattice (0.5 at. % to Pb2+), the perovskite crystallinity and grain size are increased, the perovskite film morphology is improved, the energy level alignment is optimized, and the trap density and charge recombination are reduced. As a consequence, a decent PCE improvement from 7.81 to 10.4% is achieved along with an enhancement ratio of 33% with a CsPbIBr2-based PSC. Furthermore, the long-term stability of CsPbIBr2-based PSCs against moisture and heat also remarkably improved by Cu2+ doping. This work provides a facile and effective route to improve the PCE and long-term stability of CsPbIBr2-based all-inorganic PSCs.
研究领域:
光伏技术
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材料科学
·
无机化学
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可再生能源
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Jiajun Yang,Hongyang Yu,Shengcheng Wu,Chen Cai,Jinwei Gao,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
To improve the microstructure of low-temperature-processed CsPbIBr2 films, a chlorobenzene (CB) and isopropyl alcohol (IPA) mixed solution is used as an antisolvent to fabricate CsPbIBr2 films. It is found that the modified film by the mixed antisolvent demonstrates a better morphology, crystallinity, absorption of sunlight, less trap-state density (Ntrap), and suppressed carrier recombination. The modified perovskite solar cells (PSCs) without a hole-transport layer (HTL) achieve a champion efficiency of 7.05%, being much higher by 28.18% than that of the Reference-PSCs without an antisolvent. Moreover, the HTL of undoped zinc phthalocyanine (ZnPc) prepared by solution processing is used to promote charge transfer and protect the CsPbIBr2 film from damage caused by humid air at the CsPbIBr2/carbon interface. The best PSC with a structure of FTO/TiO2/CsPbIBr2/ZnPc/carbon yields a champion efficiency of 8.48% (Reference-PSC, 5.50%) with an open-circuit voltage of 1.23 V. The modified PSCs without encapsulation demonstrate improved humidity stability and retain about 90% (Reference-PSC, ∼70%) of their initial efficiency after storage at a 20% relative humidity in air for 30 days. In addition, the modified PSCs possess good light and thermal stability. Our work provides a feasible low-temperature (150 °C) process to prepare CsPbIBr2 films with the preferred orientation and stable, efficient all-inorganic PSCs (200 °C).
研究领域:
材料科学
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光伏技术
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无机钙钛矿太阳能电池
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薄膜制备
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可再生能源
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Andrei S. Toikka,Ramazan Kenesbay,Maria Baeva,Dmitry M. Mitin,Maria Sandzhieva,Aleksandr Goltaev,Vladimir Fedorov,Alexander Pavlov,Dmitry Gets,Ivan Mukhin,Sergei Makarov
As alternatives to conventional perovskite light-emitting diodes, perovskite light-emitting electrochemical cells (PeLECs) are in great demand in modern science and technology due to their simplified structure and attainable higher luminance. Here, for the first time, we present the implementation and characterization of red CsPbIBr2-based PeLECs/LEDs. To improve perovskite material phase stability, we applied the following strategies for mitigating the mixed anion lead halide perovskite phase segregation: Pb2+ partial substitution by Mn2+, boundary passivation by poly(ethylene oxide) with polyvinylidene fluoride, and two-step thermal treatment with vacuuming and annealing. The complex measurements of photoluminescence, optical density, energy-dispersive X-ray spectroscopy, and X-ray diffraction confirm the minor phase segregation in the optimized perovskite layers. The performed ab-initio calculations predicted the band gaps of perovskite materials with a mixed anion composition, corresponding well to the results of optical measurements. Finally, current and electroluminescence time tracking proved the formation of a dynamic p–i–n structure in the studied PeLEC devices. The developed PeLECs/LEDs exhibited relatively high, for red PeLECs, electroluminescence up to 96 cd m−2 with a peak position at 667–672 nm.
研究领域:
材料科学
·
光电技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Xiao Liu,Yu Jing,Ruoshui Li,Deng Wang,Chunyan Wang,Zhongliang Yan,Weihai Sun,Jihuai Wu,Zhang Lan
Solution-prepared perovskite films are accompanied by high defect density . Defects gathered on the surface or grain boundaries of the perovskite accelerate the degradation of the perovskite and affect the photovoltaic performance and long-term stability of the device, which is one of the bottlenecks to curb the further development of perovskite solar cells (PSCs). In this work, a simple and effective surface passivation method is designed by choosing metal (IIB) diethyldithiocarbamate salts [M(DDTC) 2 , M = Pb 2+ , Cd 2+ and Zn 2+ ]. The DDTC has excellent complexing ability with metal ions and chelate bidentately with unpaired Pb 2+ ions on the surface of perovskite. IIB metal ions have a small ion radius and could easily diffuse into the perovskite to occupy Pb vacancies. The synergistic effect of anions and cations effectively reduces the defect concentration and non-radiative recombination in the CsPbIBr 2 all-inorganic perovskite, thereby obtaining carbon-based CsPbIBr 2 all-inorganic PSCs with high efficiency and high stability. Ultimately, champion efficiency of the Cd(DDTC) 2 and Zn(DDTC) 2 -treated CsPbIBr 2 PSCs yield 9.59% and 10.21%, respectively, obviously higher than that of the pristine one (8.74%).
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Qi Liu,Junming Qiu,Xianchang Yan,Yuemeng Fei,Yue Qiang,Qingyan Chang,Yi Wei,Xiaoliang Zhang,Wenming Tian,Shengye Jin,Ze Yu,Licheng Sun
All-inorganic CsPbIBr 2 perovskite solar cells (PSCs) have attracted considerable research attention in recent years due to their excellent thermal stability. However, their power conversion efficiencies (PCEs) are relatively low and still far below the theoretical limit. Here, we report the use of an organic dye molecule (namely VG1-C8) as a bifunctional interlayer between perovskite and the hole-transport layer in CsPbIBr 2 PSCs. Combined experimental and theoretical calculation results disclose that the multiple Lewis base sites in VG1-C8 can effectively passivate the trap states on the perovskite films. Meanwhile, the π-conjugated dye molecule significantly accelerates the hole extraction from the perovskite absorber as evidenced by the photoluminescence analysis. Consequently, the VG1-C8 treatment simultaneously boosts the photovoltage and photocurrent density values from 1.26 V and 10.80 mA cm −2 to 1.31 V and 12.44 mA cm −2 , respectively. This leads to a significant enhancement of PCE from 9.20% to 12.10% under one sun irradiation (AM 1.5G). To our knowledge, this is the record efficiency reported so far for CsPbIBr 2 PSCs. Thus, the present work demonstrates an effective interfacial passivation strategy for the development of highly efficient PSCs.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junshuai Zhang,Jialong Duan,Qiaoyu Zhang,Qiyao Guo,Furi Yan,Xiya Yang,Yanyan Duan,Qunwei Tang
Intramolecular structure of interfacial passivator highly determines the bond strength with detrimental defects located at perovskite surfaces and grain boundaries. Herein, we investigate the steric-charge-dependence of various π-conjugated pyridine derivatives on electron-donating ability to passivate inorganic CsPbIBr 2 perovskite film. The primary results demonstrate that the photovoltaic performances tightly correlate with the multidentate coordination sites and structure-steric hindrance because of their synergistic regulation on intramolecular electron-cloudy density and charge extraction. Comparing to pyridine and terpyridine treated devices, the bipyridine passivated device delivers an increased efficiency of 11.04% with a high open-circuit voltage of 1.301 V and improved stability after persistent irradiation over 20 h and storage for 60 days, which is one of the highest efficiencies for carbon-based all-inorganic CsPbIBr 2 solar cells. This work provides a direction to choose ideal passivator for high-efficiency perovskite optoelectronics.
研究领域:
材料科学
·
光伏技术
·
有机-无机杂化材料
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）