ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 16
·2108944
·
IF 18.808
Ning Wei,Yuetian Chen,Xingtao Wang,Yanfeng Miao,Zhixiao Qin,Xiaomin Liu,Hao Wei,Yixin Zhao
The photovoltaic performance and long-term stability of perovskite solar cells (PSCs) are greatly affected by trap states. Herein, a functional ionic liquid of 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMTFA) is introduced, in which the 1-ethyl-3-methylimidazolium cations (EMIM + ) can interact with PbI 2 to form a stable one-dimensional (1D) perovskite of EMIMPbI 3 , and the trifluoroacetic acid anions (TFA − ) can passivate the interface between the electron transfer layer and the perovskite layer. Unlike, the widely studied low dimensional perovskite capping layers or quasi-2D configuration, the EMIM + cations not only distribute on the top surface and inside the bulk phase, but also accumulate at the buried interface of 3D perovskite film, achieving a multi-level distribution. The different defect states are successfully passivated by this distribution mode, leading to a significant decrease of non-radiative recombination. As a result, the methyammonium lead iodide-based PSCs with the EMIMTFA additive show an enhanced photovoltaic performance with a champion power conversion efficiency up to 22.14% and improved long-term stability. This work demonstrates that the formation of multilevel low-dimensional structure is a new strategy for the preparation of efficient and stable PSCs.
研究领域:
材料科学
·
光伏技术
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yue Han,Rui Gao,Wenbo Zeng,Yuying Xi,Chen Tang,Ting Ji,Yanxia Cui,Guohui Li
Photodetectors (PDs) capable of detecting weak light are critical for applications like astronomical observation, quantum computing, cryogenic biomedical imaging, material analysis and precision measurements. Perovskite materials, due to their high carrier mobility, long diffusion lengths, and solution processability, offer substantial advantages in PD performance. In this study, we fabricated high-quality single-crystalline nanowires (NWs) of methylammonium lead iodide (MAPbI3) and developed a high-performance metal–semiconductor-metal PD operating at 85 K. The device demonstrated an extremely low dark current of 3.7 × 10–13 A (1 V) at 85 K, 4 orders of magnitude lower than at room temperature (RT). Its detectivity exceeded RT performance by a factor of 706, reaching 7.7 × 1013 Jones, and achieved a phototo-dark current ratio exceeding 108 under 532 nm light illumination at 204 mW/cm2. As the optical power density decreased to 12 nW/cm2, detectivity further increased to 2.7 × 1015 Jones. These improvements are linked to the phase transition from tetragonal to orthorhombic crystal structure, which results in a widened bandgap. At 85 K, thermally excited carriers and ion migration are significantly suppressed, and defect self-annihilation is promoted, leading to a much-reduced dark current. Additionally, the reduced defects lower nonradiative recombination and the ordered molecular arrangement could enhance the generation and transport of photogenerated charge carriers under illumination with a power density above 40 μW/cm2 (532 nm) at 85 K. This work sets a benchmark for MAPbI3 PD performance, demonstrating the potential of perovskite-based devices for weak light detection.
研究领域:
材料科学
·
光电子学
·
凝聚态物理
·
低温物理
·
半导体器件
·
纳米材料
·
光电探测技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Li Yujiao,Li Chen,Yu Huanqin,Yuan Beilei,Xu Fan,Wei Haoming,Cao Bingqiang
To regulate the optical and electrical properties of the crystals and films of the intrinsic methylammonium lead iodide (CH3NH3PbI3), we dope them with sodium (Na) by selecting sodium iodide (NaI) as a dopant source. The highly conductive p-type sodium-doped CH3NH3PbI3 (MAPbI3: Na) perovskite single crystals and thin films are successfully grown using the inverse temperature crystallization (ITC) method and antisolvent spin-coating (ASC) method, respectively. With the increase of Na+ doping concentration, the grain size of the film increases, the surface becomes smoother, and the crystallinity improves. Hall effect results demonstrate that both the MAPbI3: Na thin films and single crystals change their quasi-insulating intrinsic conductivity to a highly conductive p-type conductivity. The room-temperature photoluminescence (PL) peaks of doped MAPbI3 films slightly blue shift, while the photocarriers' lifetime becomes longer. The optical fingerprints of the doped levels in MAPbI3: Na perovskites can be identified by temperature-dependent PL. Obvious fingerprints of Na-related acceptor (A0X) levels in the doped MAPbI3: Na were observed at 10 K. These results suggest that sodium doping is an effective way to grow highly conductive p-type MAPbI3 perovskites.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2023
·
IF 5.8
Yuming Hu,Tingqing Wu,Jiabing Zhang,Wei Sun,Mengfei Lv,Hongfei Xie,Tangyue Xue,Teng Han,Chunbao Li,Meng Su,Yanlin Song
Reliable monitoring the movement amplitude and dynamics during sports exercise is significant for improving training results and preventing training wound. Here, we present a printed perovskite-based photodetector for real-time and quantitative monitoring of sports motion. The ordered nucleation and growth of perovskite crystals are regulated by the 4-acetamidothiophenol (AMTP) at the interface, which promotes the size of perovskite crystals into the micrometer. Benefiting from the uniformity of the AMTP-regulated MAPbI 3 , the as-prepared photodetector gives great photocurrent response under indoor light or outdoor light. During the exercise, real-time monitoring sports motion is achieved through detecting the illumination changing of photodetectors attaching on the wrist and ankles. Moreover, twelve kinds of common sports can be quantitatively analyzed with the detection of illumination changing on the photodetector. Such photodetector provides an efficient measurement method of wearable electronics for sports monitoring.
研究领域:
材料科学
·
生物医学工程
·
运动科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jinxia Duan,QingWen Yue,Qiu Xiong,Liqian Wang,Linlu Zhu,Kai Zhang,Jun Zhang,Hao Wang
We have demonstrated a two-step wet-chemical route to prepare dense a SnO 2 blocking layer (BL) for boosting efficaciously the optoelectronic performance of mesoporous-TiO 2 based perovskite solar cells (PSCs). Through SnCl 4 water-bath for moderate time, the surface features of SnO 2 BL are availably optimized and recombination loss of the devices is perceptibly suppressed. The influence of bath-time upon the microstructures and photoelectronic properties of SnO 2 BL and photovoltaic characteristics of the corresponding PSCs , has been discussed detailedly. Deep-going explorations on charge dynamics confirm that SnCl 4 bath would facilitate charge transport, hinder charge accumulation and inhibit nonradiative recombination. Upon the basis of surface decoration of SnO 2 , we improve the open-circuit photovoltage from 1.02 V of initial cell to 1.06 V, and achieve a maximum photovoltaic efficiency of 17.14% and null hysteresis. Accordingly, the device with large area (1.0 cm 2 ) based on modified SnO 2 have higher PCE of 14.35% and weaker hysteresis index of 0.019 than its unmodified SnO 2 courtpart.
研究领域:
材料科学
·
光伏技术
·
表面化学
·
纳米材料
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 12
·942
·
IF 3.2
Guo Chaofan,Du Yiping,Guan Haoyang,Zhu Jinglong,Ma Lin,Yan Zhengguang,Xiao Jiawen
Narrowband photodetectors exhibit considerable potential for high-resolution imaging and encrypted communication systems owing to their high spectral resolution capabilities. In this study, a composite perovskite single-crystal heterojunction (SCH) consisting of MAPbBr 3 and MAPbI 3 was fabricated by epitaxially growing MAPbI 3 on a MAPbBr 3 single crystal substrate. A carbon paste light-window electrode was applied to the MAPbI 3 surface following a spatially modulated electrode strategy. The resulting device demonstrates outstanding narrowband detection performance, featuring a full width at half maximum ( FWHM ) of 21 nm, a spectral rejection ratio ( SRR ) of 137, a specific detectivity of 1.24 × 10 11 Jones (cm Hz 1/2 W −1 ), a responsivity of 0.56 A W −1 , and a fast response time (34.86/42.81 μs). The exceptional narrowband detection capabilities of this single-crystal heterojunction device would broaden the application prospects of perovskite-based photodetectors in the field of optoelectronics.
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2026
·
IF 13.8
Zhaohui Fang,Zhihan Yu,Yulong Liao,Yuanxun Li,Minshu Chen,Yuan Teng,Quanjun Xiang
Introducing ferroelectric spontaneous polarization (Ps) electric field to suppress the recombination of photogenerated carriers is crucial for enhancing catalytic activities. Herein, we report a strategy to effectively facilitate the ferroelectricity and charge carrier behavior by compositing MAPbI 3 with hydroxyl-containing (EOA) 2 PbBr 4 . Density functional theory calculations reveal that the hydroxyl groups will alter the orientation of polar MA + ions, leading to a more uniform alignment with the polarization direction in MAPbI 3 . The ferroelectric-related piezoelectric constant and spontaneous electric potential demonstrate significant improvements, reaching 43.81 pm V −1 and −876.2 mV, respectively, as measured by piezoresponse force microscopy and kelvin probe force microscope. Furthermore, the increase in the intensity of the steady-state surface photovoltage (SPV) signal and the slow attenuation of the transient SPV signal in (EOA) 2 PbBr 4 /MAPbI 3 indicate an enhanced Ps electric field, enabling desirable spatial separation of photogenerated carriers. Moreover, photocatalytic CO 2 reduction shows that the CO production rate of the (EOA) 2 PbBr 4 /MAPbI 3 reached 90.37 μmol g −1 , representing a 2.5-fold increase compared to MAPbI 3 . Overall, this work presents a novel approach to designing high-performance halide perovskite photocatalytic materials by manipulating ferroelectricity effects through functional groups.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yin Xie,Xiaowei Xu,Yan Cui,Liang Qiao,Kebin Chi,Dejun Shi,Yang Bai,Zhijie Wu,Shengbao He
Solvent is vital in determining the colloidal chemistry of perovskite ink. A depth understanding on the colloidal chemistry is essential to fine-regulate the crystallization of perovskite film. A low-polar solvent, 2-methoxyethanol (2-Me), shows growing potential than the traditional high-polar solvents in scaling-up perovskite solar cells, owing to the fast evaporation rate and the ability to form perovskite films without anti-solvent. However, as a relatively new solvent, the colloidal chemistry has not been fully understood. Here, the colloidal chemistry of fresh and aged perovskite ink using 2-Me as the solvent is investigated. The as-composed perovskite ink is characteristic of weakly bonded I - ions and the existence of cluster complexes. In the fresh perovskite ink, the weakly bonded I - ions enhance the dissolution of methylammonium (MA + ), and also induce the formation of I 3 - ions in the diluted or aged solution. Both iodoplumbate species and cluster complexes are dispersed by MA + ions in the solution, however, the former transforms to clusters after aging. These changes results in increased crystal size and non-uniform coverage in the perovskite film. These findings provide valuable insights into the optimization of perovskite ink using 2-Me as the solvent.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Zhiyuan Zuo,Jianxu Ding,Yongfu Li,Ying Zhao,Songjie Du
Organic–Inorganic hybrid perovskites attract intensive attentions due to significant optoelectronic performances. However, abnormal phenomena such as photocurrent hysteresis and slow photoconductivity response caused by ion migration made ionic transportation properties to be a hot topic in this area. Thinking of serious influences such as efficiency decay of excited carrier separation and poor reliability are caused by ion migration, systematical research on this topic is still highly demanded. Here, anisotropic ionic transportation performances of (100) and (112) planes in MAPbI 3 single crystal have been investigated with various photon excitation conditions. Enhanced ionic conductance had been extracted on (112) plane both with and without illuminations. Comparing to exponential saturation revealed by the electrons, the ionic conductance exhibits a linear increase trends with incident light power in MAPbI 3 .
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Zihan Zhang,Mingxuan Sun,Wen Ding,Bowen Gao,Xiaojing Lin
A composite of methylammonium lead iodide perovskite (MAPbI 3 ) and carbon dots is prepared under ultrasound irradiation. Characterizations of X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, emission field scanning electron microscopy, Raman spectra and UV-Vis diffuse reflectance spectroscopy are performed. Excellent photoelectrochemical properties of prepared composites are examined by a collection of measurements including photocurrent density, open-circuit potential, current–voltage curves, cyclic voltammetry curves and Nyquist plots. The results imply that the as-prepared composites exhibit better electrochemical and photoelectrochemical properties as well as stability than those of blank MAPbI 3 . The improved properties are due to the formed Pb–O–C bridge bonds in the composites, which can promote the generation and transport of charge carriers. This work provides a novel sonochemical synthesis strategy and investigation on the photoelectrochemical performance of MAPbI 3 /carbon dots composites.
研究领域:
材料科学
·
光伏学
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Hao Hu,Jianping Yang,Junfeng Chen,Jiaxuan Hao,Ping Lin,Lingbo Xu,Peng Wang,Xiaoping Wu,Tiantian Liu,Can Cui
Perovskite single crystals offer superior optoelectronic properties but face challenges in spectral response range and device performance. Here, we report a high-performance photodetector based on Rb-doped MAPbBr 3 /MAPbI 3 heterojunction fabricated via liquid-phase epitaxy. Systematic characterization reveals that Rb + incorporation effectively reduces defect density (from 3.02 × 10 9 to 2.48 × 10 9 cm −3 ) and prolongs carrier lifetime (from 12.09 ns to 145.41 ns), while the integration with MAPbI 3 microcrystals extends the spectral response range from the green to the red region (450–750 nm). DFT calculations and UPS reveal that Rb doping tailors the electronic structure of MAPbBr 3 , optimizing band alignment with MAPbI 3 to enhance built-in field for charge separation while increasing work function to suppress dark current. Consequently, the Rb-doped heterojunction device achieves an order-of-magnitude enhancement in both responsivity (600 m A/W) and detectivity (~2.5 × 10¹² Jones), together with excellent operational and environmental stability (retaining >70% performance after 90 days in air), and a fast response time of 6.29 μs. This work establishes Rb doping as an effective strategy integrating defect passivation and band engineering for high-performance perovskite photodetectors.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yuanhao Li,Yukun Wang,Zuhuan Lu,Zongming Yu,Tianyi Zhang,Wenhong Sun
Methylammonium lead iodide is widely used in the preparation of photodetectors because of its excellent photovoltaic properties. However, because of the nature of the perovskite polycrystals, the low-temperature solution treatment approach of creating perovskite thin films causes flaws to arise in the material. Undercoordinated lead ions (Pb2+) have been shown to have comparatively low formation energies among all defect species and to be a major contributor to defect creation. Here, we use a straightforward but efficient additive engineering strategy to introduce tetrafluoroterephthalonitrile as an additive into the perovskite precursor solution to passivate perovskite defects and improve the quality of perovskite thin films for the production of high-efficiency perovskite photodetectors. We demonstrated that –CN (cyano) and polyfluorine atoms in the structure of TFTPN may passivate defects caused by lead ions and prevent the releasing of organic cations (MA+), improving the stability of the perovskite structure and the quality of perovskite films. Consequently, we designed perovskite photodetectors with TFTPN that demonstrated exceptional performance in terms of photoresponse, detection and other areas. These devices had a maximum peak external quantum efficiency (EQE) of 91.73%, a lower dark current density of 8.86 × 10−11 A cm−2, a linear dynamic range (LDR) of 105.4 dB, and more. Furthermore, the perovskite photodetector's durability is enhanced by the addition of TFTPN, and after 20 days of storage in an air environment at 25 °C and 20–30% relative humidity, the device retains its original efficiency of 92.3%.
研究领域:
材料科学
·
光电技术
✓ 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）