ADVANCED FUNCTIONAL MATERIALS
·
2015
·Vol. 25
·期 30
·4867-4873
·
IF 11.805
Yunlong Li,Weihai Sun,Weibo Yan,Senyun Ye,Haitao Peng,Zhiwei Liu,Zuqiang Bian,Chunhui Huang
Solution-processable hybrid perovskite solar cells are a new member of next generation photovoltaics. In the present work, a low-temperature two-step dipping method is proposed for the fabrication of CH 3 NH 3 PbI 3- x Cl x perovskite films on the indium tin oxide glass/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) substrate. The bandgaps of the CH 3 NH 3 PbI 3- x Cl x perovskite films are tuned in the range between 1.54 and 1.59 eV by adjusting the PbCl 2 mole fraction ( n Cl /( n Cl + n I )) in the initial mixed precursor solution from 0.10 to 0.40. The maximum chlorine mole fraction measured by a unique potentiometric titration method in the produced CH 3 NH 3 PbI 3- x Cl x films can be up to 0.220 ± 0.020 ( x = 0.660 ± 0.060), which is much higher than that produced by a one-step spin-coating method (0.056 ± 0.015, x = 0.17 ± 0.04). The corresponding solar cell with the CH 3 NH 3 PbI 2.34±0.06 Cl 0.66±0.06 perovskite film sandwiched between PEDOT:PSS and C 60 layers exhibits a power conversion efficiency as high as 14.5%. Meanwhile, the open-circuit potential ( V oc ) of the device reaches 1.11 V, which is the highest V oc reported in the perovskite solar cells fabricated on PEDOT:PSS so far.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
THIN SOLID FILMS
·
2018
·
IF 1.939
Chunfeng Lan,Huabin Lan,Guangxing Liang,Jun Zhao,Huanxin Peng,Bo Fan,Zhuanghao Zheng,Huibin Sun,Jingting Luo,Ping Fan,Yong Qing Fu
A new antisolvent method was developed to prepare CH 3 NH 3 PbI 3 and electron transport layers for making efficient hybrid perovskite solar cells . By directly using [6,6]-phenyl-C61-butyric acid methyl ester in chlorobenzene solution as antisolvent, CH 3 NH 3 PbI 3 and electron transport layers were simultaneously formed in the films. This method not only simplifies the fabrication process of devices, but also produces uniform perovskite films and improves the interfacial structures between CH 3 NH 3 PbI 3 and electron transport layers. Large perovskite grains were observed in these films, with the average grain size of >1 μm. The so-formed CH 3 NH 3 PbI 3 /electron transport layers demonstrated good optical and charge transport properties. And perovskite solar cells fabricated using these simultaneously-formed layers achieved a higher power conversion efficiency of 16.58% compared to conventional antisolvent method (14.92%). This method reduces nearly 80% usage of chlorobenzene during the fabrication, offering a more facile and environment-friendly approach to fabricate efficient perovskite solar cells than the conventional antisolvent method.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Xuehui Pang,Yong Zhang,Jihong Pan,Yanxia Zhao,Yao Chen,Xiang Ren,Hongmin Ma,Qin Wei,Bin Du
Based on ZnO nanorods (NRs)/CH 3 NH 3 PbI 3 /nitrogen-doped carbon quantum dots (NCQDs) nanocomposites , the highly sensitive detection of fibroblast-like synoviocyte (FLS) cell was realized by a photoelectrochemical (PEC) biosensor. ZnO/CH 3 NH 3 PbI 3 /NCQDs nanocomposites were exploited as the photo-to-electron generator to produce the signal. CH 3 NH 3 PbI 3 was spin-coated on ZnO surface after ZnO NRs grew on ITO electrode then by dropping on the modified electrode , NCQDs were diffused and adhered to the surface of ZnO and CH 3 NH 3 PbI 3 . In the presence of EDC/NHS, the combination of CH 3 NH 3 PbI 3 and NCQDs was achieved by the carboxyl groups (–COOH) and amino groups (–NH 2 ) in the preparation process. Furthermore, the capture probe of FLS cell, CD95 antibody, can be anchored by –COOH and –NH 2 groups through EDC/NHS. The specific recognition between the antibody capture probes and cell targets gained high-sensitive detection for FLS cell for the first time. The developed biosensor showed a wide linear range from 1.0×10 4 cell/mL to 10 cell/mL and a low detection limit of 2 cell/mL. This kind of biosensor would provide a novel detection strategy for FLS cell.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Ying Zhao,Jian Liu,Xinrong Lu,Yandong Gao,Xiaozeng You,Xiangxing Xu
Perovskite-structured organic–inorganic materials such as CH 3 NH 3 PbI 3 are attracting much interest in the scientific community because of their abilities to function as revolutionary light harvesters and charge transfer materials for solar cells. To achieve high power conversion efficiency (PCE), it is critical to optimize the perovskite film layer. This paper reports the temperature and concentration controls on the two-step solution process. A diffusion-controlled growth mechanism is proposed for this process in tuning the morphology and purity of the perovskite film, which are proven to be important factors contributing to the photovoltaic performance. The highest PCE of 11.92% is achieved with an optimized perovskite crystal size of ∼150 nm and an appropriate amount of residual PbI 2 . This study sheds light on the design and fabrication of highly efficient, low-cost, solution-processed perovskite solar cells.
研究领域:
材料科学
·
太阳能电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qing Liu,Yu Qing Yang,Xingfu Wang,Weidong Song,Xingjun Luo,Jiaqi Guo,Jiang Shi,Chuan Cheng,Dongyang Li,Longfei He,Kai Li,Fangliang Gao,Shuti Li
ABSTRACT In recent years, the combination of perovskites with other materials to improve the photoelectric performance has received widespread attention. In this work, we demonstrate a hybrid heterostructure photodetector with the combination of GaN microwire array and perovskite. Compared to perovskite and GaN microwire array photodetectors, the hybrid CH 3 NH 3 PbI 3- x Cl x /GaN microwire array photodetector exhibits more excellent photoelectric performances in a wide detection range from ultraviolet to visible. Under 325 nm laser irradiation, the hybrid photodetector generates a large photocurrent (1.04 ×10 -5 A), a high on/off ratio (>10 4 ), a fast response time (raise time of 0.66 ms and decay time of 0.71 ms), and higher responsivity , detectivity. Meanwhile, when the perovskite is combined with the GaN microwire array, the device also has a higher photocurrent, on/off ratio, and faster photoresponse compared with the perovskite photodetector in the visible light region. This is interpreted as the effective separation photogenerated carriers at the hetero-interface, and the directional transfer of carriers within the one-dimensional GaN microwire array. This study sheds light on fabricating high-performance heterostructures photodetectors.
研究领域:
材料科学
·
光子学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Han Su,Lina Meng,Yucheng Liu,Yunxia Zhang,Mingxin Hu,Zhou Yang,Shengzhong (Frank) Liu
Increasing the carrier concentration as well as carrier life time could be effective ways to increase the photoresponse of a photoconductive type photodetector . In this paper, layer-structure photodetectors have been fabricated by connecting CH 3 NH 3 PbI 3 film with and without electron transport layer (SnO 2 and SnO 2 /PCBM bilayer). We found that the electron extraction at the electron transport layer and MAPbI 3 interface will boost the photocurrent and responsivity, and faster electron extraction will result in a higher photocurrent improvement. At the same time, the closer is the distance of the interface to the photogenerated electron-hole pairs, the larger is the photocurrent enhancement. The largest photocurrent increasement is almost 3 times the initial value, which increases from 1.54 μA to 6.10 μA.
研究领域:
材料科学
·
光子学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 12
·6600-6608
·
IF 7.76
Shimao Wang,Weiwei Dong,Xiaodong Fang,Qingli Zhang,Shu Zhou,Zanhong Deng,Ruhua Tao,Jingzhen Shao,Rui Xia,Chao Song,Linhua Hu,Jun Zhu
The role of remnant PbI2 in CH3NH3PbI3 films is still controversial, some investigations have revealed that the remnant PbI2 plays a passivation role, reduces the charge recombination in perovskite solar cells (PSCs), and improves the performance of PSCs, but the opposing views state that remnant PbI2 has no passivation effect and it would deteriorate the stability of the devices. In our investigation, the CH3NH3PbI3 films have been prepared by a two-step spin-coating method and the content of the remnant PbI2 in CH3NH3PbI3 films has been tuned by varying the preparation temperature. It has been found that increasing the heating temperature could increase the coverage of spin-coated PbI2 films, which has led to high coverage CH3NH3PbI3 films and more remnant PbI2 in CH3NH3PbI3 films, and as a result, the performance of PSCs was enhanced obviously and the maximum power conversion efficiency of 14.32 ± 0.28% was achieved by the PSCs prepared at 130/120 °C (PbI2 films were heated at 130 °C and CH3NH3PbI3 films were heated at 120 °C). Furthermore, the dark current, electrochemical impedance spectroscopy and time-resolved fluorescence emission decay measurements revealed that the charge recombination in PSCs has been gradually suppressed and the fluorescence emission lifetime has gradually increased with the content of remnant PbI2 increasing. Thus, the passivation effects of the unreacted and decomposed PbI2 in improving the performance of PSCs have been confirmed unquestionably.
研究领域:
材料科学
·
光伏技术
·
太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2019
·Vol. 53
·期 7
·075101
·
IF 2.829
Y Y Wang,L T Li,X Jiang,J B Wang,R L Lai,X Y Qiu
Electric field-induced drift of ions or charged defects in organic–inorganic hybrid perovskite materials generally results in distinct current–voltage hysteresis, opening up a new era in the development of low-cost resistive switching memory and neural synapse devices. Here, a new type of resistive switching memory cell based on NiO-buffered CH3NH3PbI3 films is prepared by a solution method. It exhibits stable and low voltage bipolar resistive switching behaviors: switching voltages lower than ±0.5 V, an ON/OFF ratio higher than 103, and a reversible current–voltage loop of more than 400 cycles in air ambient. Both 'iodine-vacancy conductive filaments' and the 'interfacial p–n junction effect' are responsible for the improved resistive switching properties. This work establishes the potential for application in low operation voltage organic–inorganic hybrid perovskite resistive switching devices.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICRON
·
2018
·
IF 1.728
Xuanyu Chen,Zhiwei Wang
Chemical and structural instabilities of lead halide perovskites remain a major obstacle to their large-scale applications in photovoltaic solar cells and optoelectronic devices. Herein we report on a comparative investigation of electron beam irradiation effects on (all-inorganic) CsPbI 3 and (organic-inorganic hybrid) CH 3 NH 3 PbI 3 halide perovskite thin films by transmission electron microscopy. Upon continuous electron beam irradiation with high dose rates, CsPbI 3 exhibits rather rapid morphological change and compositional degradation within irradiated regions, which are attributed to the radiolysis effect and probably assisted by electron beam heating and Coulomb forces. In contrast, for the freestanding, polycrystalline CH 3 NH 3 PbI 3 thin films, significant structural damage mainly occurs on/outside the periphery of the irradiated regions, while, within the irradiated areas, the structural configurations appear rather intact. The electron beam induced electric field effect is suggested to be the primary reason for the unusual damage phenomenon. The building up of induced electrical fields in CH 3 NH 3 PbI 3 is probably pertinent to its some unusual structural properties (e.g., rotational dynamics of organic cations), but should be also promoted by the unavoidable modifications of physical properties during the film preparation and electron beam focusing. The study provides an insight for exploring the fundamental origin of structural instabilities and property degradation of halide perovskites.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2017
·Vol. 52
·期 12
·1700171
·
IF 1
Jing Su,Di Lu,Lei Zhang,Di Wang,Yu Bai,Wangfu Wang
Organic-inorganic hybrid perovskites CH 3 NH 3 PbI 3 single crystals were grown by inversion crystallization with GBL solvent. The structural, thermal properties and morphology of CH 3 NH 3 PbI 3 crystal were characterized using PXRD, FT-IR, TG/DTA and TEM methods. The results shows the CH 3 NH 3 PbI 3 single crystals were of tetragonal phase with lattice constants a = b = 8.8526 Å and c = 12.6523 Å. The peaks of FT-IR spectrum were assigned. Thermal decomposition mechanism of CH 3 NH 3 PbI 3 in the temperature range of 25–800 °C were analyzed. HRTEM shows that the crystal grown is of good quality and dendritic crystallization was observed using GBL as solvent.
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 6
·1002
·
IF 5.719
Sushu Wan,Yajie Zhu,Daocheng Hong,Yuxi Tian
One of the unique characteristics of semiconductors is the strong dependence of their properties on crystal defects and doping. However, due to the species diversity and low density, it is very difficult to control the type and concentration of the defects. In perovskite materials, crystal defects are randomly formed during the fast crystallization process, causing large heterogeneity of the samples. Here, in this work, we report a controllable method to introduce surface defects on CH3NH3PbI3perovskite materials via the interaction with 1,4-benzoquinone (BQ) molecules on the gas and solid interface. After the adsorption of BQ molecules on the perovskite surface, surface defects can be generated by photoinduced chemical reactions. The concentration of the defects can thus be controlled by precisely regulating the laser irradiation time. The concentration of the defects can be characterized by a gradually decreased PL intensity and lifetime and was found to influence the atmospheric response and the subsequent acetone-induced degradation of the materials. These results demonstrate that crystal defects in perovskite materials can be controllably introduced, which provides a possible way to fully understand the correlation between the nature and chemical structure of these defects.Keywords:lead halide perovskite;polycrystalline thin films;defect modification;defect concentration;optical microscopy
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
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Daocheng Hong,Sushu Wan,Yuxi Tian
Organometal halide perovskites have attracted broad interest over the last several years for their promising applications in solar cells and light-emitting devices. It is believed that crystal defects play important roles in the photophysical processes. However, the detailed mechanism is still unclear. In this work, by using luminescence microscopy, we characterized the quenching defects correlating with crystal size, location and morphology. It is clear that needle-shaped crystals own better crystal quality with less defects; and more defects are located in the center of the crystals comparing to the edge. Relatively higher concentration of PbI 2 precursor will generate more defects during the preparation. Characterization of defects is the first step to understand the quenching mechanism and to fully understand the photophysical properties of organometal halide perovskite.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）