Nanomaterials
·
2018
·Vol. 8
·期 5
·318
·
IF 3.504
Xin Zhang,Caichi Liu,Gang Ren,Shiyun Li,Chenghao Bi,Qiuyan Hao,Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH3NH3PbI3nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH3NH3PbI3thin films, reports on the fabrication of CH3NH3PbI3nanowires for optoelectrical application are rather limited. Herein, a two-step spin-coating process has been utilized to fabricate pure-phase and single-crystalline CH3NH3PbI3nanowires on a substrate without mesoporous TiO2or Al2O3. The size and density of CH3NH3PbI3nanowires can be easily controlled by changing the PbI2precursor concentration. The as-prepared CH3NH3PbI3nanowires are utilized to fabricate photodetectors, which exhibit a fairly high switching ratio of ~600, a responsivity of 55 mA/W, and a normalized detectivity of 0.5 × 1011jones under 532 nm light illumination (40 mW/cm2) at a very low bias voltage of 0.1 V. The as-prepared perovskite CH3NH3PbI3nanowires with excellent optoelectronic properties are regarded to be a potential candidate for high-performance photodetector application.Keywords:perovskite;CH3NH3PbI3nanowires;spincoating;photodetectors
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 1
·015522
·
IF 1.929
Tingyu Song,Lifeng Gao,Qi Wei,Limin Yu,Shiwei Wang,Mingyao Zhang,Lisha Zhao,Yanhua Cai
Organic-inorganic hybrid halide perovskites have attracted great interest for scientists and entrepreneurs due to their intrinsic properties and considerable business prospects in recent years. Perovskite single crystal can determine its properties well because of no grain boundaries for itself, so it is necessary to study the nucleation and growth process of perovskite crystals. In this work, CH3NH3PbI3−xClx single crystals with about 10 mm sized are prepared. It's found that chlorine can restrict the nucleation and slow crystallization during the perovskite grown process. Moreover, the number of perovskite crystals can be controlled by tuning the content of chlorine in the precursor solutions, because chlorine can restrict the perovskite crystal nucleation as an inhibitor.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2016
·
IF 3.471
Yukun Wang,Dezhi Yang,Xiaokang Zhou,Saad M. Alshehri,Tansir Ahamad,Agafonov Vadim,Dongge Ma
CH 3 NH 3 PbI 3 /C 60 heterojunction photodetectors were here fabricated. The peak EQE achieves ∼80% in the visible-light range from 400 to 760 nm. Benefitting from eliminating the leakage current (PEDOT:PSS-free), extremely low dark current density (0.6 nA/cm 2 ) and high specific detectivity (2.7 × 10 13 Jones) are acquired.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 35
·12602-12609
·
IF 8.067
Chen Jia,Hongli Liu,Xiaoyuan Zhang,Shirong Wang,Xianggao Li
Self-powered photodetectors are great potential candidates in the next generation of low energy-consumption photoelectric devices. However, the planar-type metal–semiconductor–metal (MSM) self-powered photodetectors (PDs) of perovskites still suffer from poor photodetection performance. Herein, by taking advantage of the spontaneous polarization property of the CH3NH3PbI3 single crystal, which can generate an extra polarization electric field, planar-type self-powered Au/CH3NH3PbI3/Cu PDs with preferable photodetection capability is reported. The resultant PDs exhibit the maximum responsivity of 0.288 A W−1 in 400–840 nm under the superposed built-in electric field by spontaneous polarization and asymmetric Schottky junction. Furthermore, the maximum detectivity is 4.69 × 1012 Jones, which is the highest record among the planar-type MSM self-powered PDs based on a perovskite. Moreover, the PDs exhibited excellent operation stability with the photocurrent of the unencapsulated photodetector remaining at 92% after 15 days in atmospheric condition.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2016
·Vol. 81
·期 12
·1292-1298
·
IF 2.836
Jian He,Chun-Fai Ng,King Young Wong,Weifeng Liu,Tao Chen
Graphical Cellulose in solar cells : The photostability and moisture stability of CH 3 NH 3 PbI 3 solar cells is significantly improved by ethyl cellulose (EC) incorporation (see figure). The hydrogen bonds between EC and CH 3 NH 3 PbI 3 stabilize the crystal structure, which accounts for the stability improvement. Organic–inorganic hybrid perovskite solar cells have achieved high power conversion efficiencies (PCE) of around 22 %, comparable to conventional silicon and thin-film solar cells. However, the poor stability of the perovskite material is one of the significant drawbacks for its practical application. In moderate humidity, the perovskite hydrates and decomposes within hours or a few days, which deteriorates the device efficiency rapidly. Herein, is demonstrated the moisture stability and photostability of CH 3 NH 3 PbI 3 can be greatly improved through the interaction between ethyl cellulose (EC) and perovskite crystals. It is found that the CH 3 NH 3 PbI 3 film with EC incorporation is stable over 5 days in 60 % relative humidity (RH) under ambient indoor light, whereas the conventional CH 3 NH 3 PbI 3 film without EC is degraded in 1 day. After being stored in 60 % RH under ambient indoor light for 2.5 days, the solar cell with EC incorporation shows a PCE decrement from 14.08 % to 8.21 %, whereas that without EC is nearly entirely degraded (PCE=0 %). Nuclear magnetic resonance (NMR) spectroscopy shows that hydrogen bonding between EC and CH 3 NH 3 PbI 3 accounts for the improved moisture stability by stabilizing the crystal structure.
研究领域:
材料科学
·
能源技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Xiangqi Wang,Junbo Gong,Xueyan Shan,Min Zhang,Zilong Xu,Rucheng Dai,Zhongping Wang,Shimao Wang,Xiaodong Fang,Zengming Zhang
During the last few years, the organic–inorganic hybrid methylammonium lead halide perovskite, CH3NH3PbX3 (MAPbX3, X = I–, Cl–, Br–), has received great interest in the field of photovoltaics. Relevant researches develop rapidly due to the excellent properties of MAPbI3, such as high charge mobility, suitable band gap, and long carrier diffusion length. However, the instability of MAPbI3 has been a key issue hindering practical application. Here, we present in situ spectroscopic ellipsometry measurement to monitor the thermal degradation process of MAPbI3. The dynamic evolution of dielectric functions of the as-prepared MAPbI3 films through degradation is extracted by an effective medium approximation model fitting the ellipsometry spectrum. The content proportion of MAPbI3 and PbI2 is also obtained from the modeling results. The thickness of the film decreases in two steps corresponding to the degradation and melting–recrystallization process. The current work shows that ellipsometry provides a potentially fast and non-damage tool to monitor the degradation process and to determine the degree of degradation for MAPbI3 perovskite films. Our work exhibits the first in situ monitoring of the optical properties through the degradation process of MAPbI3 films, which can be consulted for further testing of the degree of degradation for MAPbI3 solar cells and improving the stability of MAPbI3.
研究领域:
材料科学
·
光伏技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 2
·405
·
IF 5.076
Daocheng Hong,Mingyi Xie,Yuxi Tian
Solution-processed organometal halide perovskites (OMHPs) have been widely used in optoelectronic devices, and have exhibited brilliant performance. One of their generally recognized advantages is their easy fabrication procedure. However, such a procedure also brings uncertainty about the opto-electric properties of the final samples and devices, including morphology, stability, coverage ratio, and defect concentration. Normally, one needs to find a balanced condition, because there is a competitive relation between these parameters. In this work, we fabricated CH3NH3PbI3films by carefully changing the ratio of the PbI2to CH3NH3I, and found that the stoichiometric and solvent engineering not only determined the photoluminescence efficiency and defects in the materials, but also affected the photostability, morphology, and coverage ratio. Combining solvent engineering and the substitution of PbI2by Pb(Ac)2, we obtained an optimized fabrication condition, providing uniform CH3NH3PbI3films with both high photoluminescence efficiency and high photostability under either I-rich or Pb-rich conditions. These results provide an optimized fabrication procedure for CH3NH3PbI3and other OMHP films, which is crucial for the performance of perovskite-based solar cells and light emitting devices.Keywords:CH3NH3PbI3;stoichiometric modification;morphology;photostability;solvent engineering
研究领域:
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2019
·
IF 4.018
Kun Xu,Lei Zhang
The interactions between molecules and halide perovskite surfaces are important for halide perovskite-based optoelectronic and energy conversion systems. In this manuscript, we investigate the interactions between N3 dye, a famous dye widely employed for dye-sensitized solar cells, and halide perovskite CH 3 NH 3 PbI 3 surface, employing combined experimental and first principles techniques. We find that the interactions between the N3 dye and CH 3 NH 3 PbI 3 are synergistic for the photocurrent generation from the resulting molecule/perovskite photoanode in aqueous solution. The photocurrent values significantly increase by orders of magnitude for the hybrid N3/CH 3 NH 3 PbI 3 system compared with those of the individual components under visible light. The first principles calculations reveal the detailed structural, electronic and optical properties of the N3/CH 3 NH 3 PbI 3 hybrid systems. This study facilitates the fundamental understanding of the interactions between dye molecules and halide perovskite materials, and benefits the design of surface engineered halide perovskite materials for optoelectronic and energy conversion applications.
研究领域:
材料科学
·
光电转换
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Zhang Hao,Tao Mian,Gao Baizhi,Chen Wei,Li Qi,Xu Qingyu,Dong Shuai
The fabrication of high-quality organic-inorganic hybrid halide perovskite layers is the key prerequisite for the realization of high efficient photon energy harvest and electric energy conversion in their related solar cells. In this article, we report a novel fabrication technique of CH 3 NH 3 PbI 3 layers based on high temperature chemical vapor reaction. CH 3 NH 3 PbI 3 layers have been prepared by the reaction of PbI 2 films which were deposited by pulsed laser deposition, with CH 3 NH 3 I vapor at various temperatures from 160 °C to 210 °C. X-ray diffraction patterns confirm the formation of pure phase, and photoluminescence spectra show the strong peak at around 760 nm. Scanning electron microscopy images confirm the significantly increased average grain size from nearly 1 μm at low reaction temperature of 160 °C to more than 10 μm at high reaction temperature of 200 °C. The solar cells were fabricated, and short-circuit current density of 15.75 mA/cm 2 , open-circuit voltage of 0.49 V and fill factor of 71.66% have been obtained.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 21
·18868-18877
·
IF 2.324
Zheng Haisong,Li Chenghui,Wei Aixiang,Liu Jun,Zhao Yu,Xiao Zhiming
In this paper, a two-step method is used to prepare a high-quality CH 3 NH 3 PbI 3 layer for carbon-based hole conductor-free perovskite solar cells (PSCs). In the first step, the solvent for the PbI 2 /DMF solution is changed to a mixed solvent of N,N -dimethylformamide (DMF) with dimethyl sulfoxide (DMSO) from pure DMF solvent. This process requires 3.5 h for PbI 2 films deposited from the PbI 2 /DMF solution to completely convert to perovskite in a methyl amine iodide (MAI)/iso-propyl alcohol (IPA) solution, and perovskite films have a rough surface with a few large crystals. This mixed solvent accelerates the conversion of PbI 2 to CH 3 NH 3 PbI 3 , resulting in smooth CH 3 NH 3 PbI 3 films without residual PbI 2 . Only 15 min are required for PbI 2 films to completely convert to perovskite when the volume ratio of DMSO to DMF is 1:4. As a result, the photovoltaic performance, especially on the fill factor (FF) of PSCs fabricated from DMF/DMSO solvent, improved mainly due to the better contact of perovskite/carbon interface and faster charge transport of the perovskite layer.
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
Chinese Physics B
·
2022
·Vol. 31
·期 3
·037802
·
IF 1.652
Weifeng Ma,Chunjie Ding,Nasrullah Wazir,Xianshuang Wang,Denan Kong,An Li,Bingsuo Zou,Ruibin Liu
The methylammonium lead triiodide (CH3NH3PbI3)-based perovskite shows a great alluring prospect in areas of solar cells, lasers, photodetectors, and light emitting diodes owing to their excellent optical and electrical advantages. However, it is very sensitive to the surrounding oxygen and moisture, which limits its development seriously. It is urgent to spare no effort to enhance its optical and electrical stability for further application. In this paper, we synthesize the MAPbI3 perovskite film on the glass substrate with/without the ionic liquid (IL) of 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) by a simple two-step sequential solution method. The additive of BMIMBF4 can improve the quality of crystal structure. Moreover, the photo-luminescence (PL) intensity of MAPbI3 film with BMIMBF4 is much stronger than the pure MAPbI3 film after a week in the air, which is almost ten-fold of the pure one. Meanwhile, under the illumination of 405-nm continuous wave (CW) laser, the fluorescent duration of the MAPbI3 film with BMIMBF4 is approximately 2.75 min, while the pure MAPbI3 film is only about 6 s. In fact, ionic liquid of BMIMBF4 in the perovskite film plays a role of passivation, which prevents the dissolution of MAPbI3 into CH3NH3 and PbI2 and thus enhances the stability of environment. In addition, the ionic liquid of BMIMBF4 possesses high ionic conductivity, which accelerates the electron transport, so it is beneficial for the perovskite film in the areas of solar cells, photodetectors, and lasers. This interesting experiment provides a promising way to develop the perovskite's further application.
研究领域:
材料科学
·
光电
·
光伏
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1124-1137
·
IF 9.931
Liangxin Zhu,Chong Chen,Fumin Li,Zhitao Shen,Yujuan Weng,Qingsong Huang,Mingtai Wang
To improve the charge separation and transport efficiency in perovskite solar cells (PSCs) with a TiO2-based hybrid mesoscopic/planar architecture, CdS and Cd(SCN2H4)2Cl2 are incorporated into the CH3NH3PbI3 active layer through in situ synthesis to prepare CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction films for PSCs. The incorporated CdS and Cd(SCN2H4)2Cl2 improve the quality of perovskite films. Moreover, Cd(SCN2H4)2Cl2 can effectively reduce the defect state density on the CH3NH3PbI3 crystal surface, which decreases charge recombination and facilitates charge transport in PSCs. Furthermore, first-principles calculations show that the I atom of CH3NH3PbI3 has a strong interaction with the Cd atom of CdS, which induces interfacial charge redistribution and charge transfer at the CH3NH3PbI3/CdS interface and therefore decreases the energy of the CH3NH3PbI3:CdS composite system, leading to more efficient electron–hole separation and improved structural stability of the perovskite bulk-heterojunction film. For the above reasons, the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction cell shows much higher efficiency and better stability than the PSCs with pure CH3NH3PbI3. The highest efficiency reaches 20.1%, which is 1.16 times that (17.3%) of the PSCs with pure CH3NH3PbI3 and is also much higher than those of previously reported CH3NH3PbI3 PSCs with a compact/mesoporous TiO2 film. Our research results may provide a new understanding for improving the structural stability and performance of PSCs.
研究领域:
材料科学
·
物理化学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
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