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
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
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
PHYSICA B-CONDENSED MATTER
·
2018
·
IF 1.453
J. Su,W.F. Wang,Y. Lei,L. Zhang,L.H. Xu,D. Wang,D. Lu,Y. Bai
In this paper, CH 3 NH 3 PbI 3-x Cl x crystal was grown by solution cooling method with CH 3 NH 3 I and PbCl 2 as raw materials. Lead compounds and CH 3 NH 3 PbI 3-x Cl x crystal with size about 6 mm × 4 mm × 2 mm were obtained. The chemical reactions with different CH 3 NH 3 I/PbCl 2 ratios were analyzed. XPS shows the content of chlorine in CH 3 NH 3 PbI 3-x Cl x is about 0.91%. PXRD, FT-IR, Raman and absorbance spectra were used to study the structure and optical properties of CH 3 NH 3 PbI 3-x Cl x by comparing with CH 3 NH 3 PbI 3 crystal. The CH 3 NH 3 PbI 3-x Cl x crystal grown is of tetragonal structure with the lattice constants a = b = 8.8165 Å, c = 12.7920 Å and the bandgap value of 1.57 eV.
研究领域:
材料科学
·
光伏技术
·
晶体生长
·
半导体材料
✓ 已验证
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
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 32
·8770-8777
·
IF 5.976
Lixin Hou,Yali Wang,Xianhao Liu,Jia Wang,Lixin Wang,Xiaowei Li,Guangsheng Fu,Shaopeng Yang
The performance of flexible perovskite solar cells (PSCs) is largely lower than that of their glass/ITO counterparts. This is mainly due to the fact that the surface of PET/ITO is rougher than glass/ITO. ITO bulges could cause the upper perovskite crystals to deteriorate, eventually leading to a large leakage current and the low performance of devices. We reduce the leakage current of PET/ITO assembled PSCs by two measures to improve the PCE of the flexible PSCs. First, double hole transport layers of PEDOT:PSS/NiO are deposited on the surface of PET/ITO, that is, a layer of PEDOT:PSS film is first spin-coated on the ITO surface and then a layer of NiO film is evaporated above to cover the small bulges on the bare ITO. Second, the dual additives of DIO and H2O were introduced to the perovskite precursor solution to control the process of crystal formation and grain growth of the perovskite absorber, finally improving the uniformity and sizes of the perovskite crystals. In conclusion, the double hole transport layers and CH3NH3PbI3−xClx perovskites with dual additives produced a perovskite film with low roughness, high uniformity and large crystal grains on PET/ITO, finally achieving flexible PSCs with the best PCE of 18.0% and excellent flexibility. Our approach provides an effective pathway to fabricate highly efficient and large-scale flexible PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2016
·Vol. 48
·期 12
·1-10
·
IF 1.29
Zhang Chong-Zhen,Li Shu-Ti,He Miao,Yuan Song-Yang,Xia Chao,Song Wei-Dong,Hu Wen-Xiao,Qin Ping,Zhao Liang-Liang,Wang Ru-Peng
We report the effects of thermal flow air post-treatment on the performance of solution-processed CH 3 NH 3 PbI 3−x Cl x based planar solar cells under high relative humidity. It is found that the treatment process results in a significant enhancement in the power conversion efficiencies from 7.06 to 10.42%. The fill factor can be controlled in more than 0.7, with low values of the standard deviations. The change of shunt resistance and series resistance reflect that a high relative humid environment may be conducive to form good interfacial contact and decrease contact resistance of device, further enhance charge carrier lifetime among the layers interface, thus improving photovoltaic performance. Moreover, the PL intensity variations indicate that the appropriate temperature of thermal flow air post-treatment reducing the recombination of localized excitons of perovskite film, hence enhancing the charge separation and transport capability. Utilizing appropriate temperature thermal flow air post-treatment under high relative humidity, high efficiency solar cells with good reproducibility were achieved.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Zhang Z. L.,Men B. Q.,Liu Y. F.,Gao H. P.,Mao Y. L.
Precursor solution of CH 3 NH 3 PbI 3-x Cl x for perovskite solar cells was conventionally prepared by mixing PbCl 2 and CH 3 NH 3 I with a mole ratio of 1:3 (PbCl 2 :CH 3 NH 3 I). While in the present study, CH 3 NH 3 PbI 3-x Cl x -based solar cells were fabricated using the precursor solutions containing PbCl 2 and CH 3 NH 3 I with the mole ratios of 1:3, 1.05:3, 1.1:3, and 1.15:3, respectively. The results display that the solar cells with the mole ratio of 1.1:3 present higher power conversion efficiency and less I-V hysteresis than those with the mole ratio of 1:3. Based on some investigations, it is concluded that the higher efficiency could be due to the smooth and pinhole free film formation, high optical absorption, suitable energy band gap, and the large electron transfer efficiency, and the less I-V hysteresis may be attributed to the small low frequency capacitance of the device.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2017
·
IF 1.277
Dan Chen,Xiaoping Zou,Hong Yang,Ningning Zhang,Wenbin Jin,Xiao Bai,Ying Yang
The morphology of compact TiO2 film used as an electron-selective layer and perovskite film used as a light absorption layer in planar perovskite solar cells has a significant influence on the photovoltaic performance of the devices. In this paper, the spin coating speed of the compact TiO2 is investigated in order to get a high-quality film and the compact TiO2 film exhibits pinhole- and crack-free films treated by 2000 rpm for 60 s. Furthermore, the effect of annealing process, including annealing temperature and annealing program, on CH3NH3PbI3-XClX film morphology is studied. At the optimal annealing temperature of 100°C, the CH3NH3PbI3-XClX morphology fabricated by multistep slow annealing method has smaller grain boundaries and holes than that prepared by one-step direct annealing method, which results in the reduction of grain boundary recombination and the increase of Voc. With all optimal procedures, a planar fluorine-doped tin oxide (FTO) substrate/compact TiO2/CH3NH3PbI3-XClX/Spiro-MeOTAD/Au cell is prepared for an active area of 0.1 cm2. It has achieved a power conversion efficiency (PCE) of 14.64%, which is 80.3% higher than the reference cell (8.12% PCE) without optimal perovskite layer. We anticipate that the annealing process with optimal compact TiO2 layer would possibly become a promising method for future industrialization of planar perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 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）