RSC Advances
·
2018
·Vol. 8
·期 1
·390-395
·
IF 2.936
Xianwei Fu,Shilong Jiao,Ning Dong,Gang Lian,Tianyu Zhao,Song Lv,Qilong Wang,Deliang Cui
A room-temperature NO2 gas sensor with excellent performances is fabricated using an MAPbI3 (MA = CH3NH3+) thin film. It presents a high response even under extremely low NO2 concentrations. Its average response and recovery times are only ∼5 s and ∼25 s at room temperature, respectively, exhibiting its quick-responsive character. In addition, the MAPbI3-based NO2 sensor exhibits good selectivity. Interestingly, the sensitivity of the MAPbI3-based NO2 sensor is strikingly improved under high-pressure gas conditions. This phenomenon can be used for the online monitoring of chemical reaction processes and in situ detection of trace-level gas impurities under high-pressure conditions. Furthermore, based on theoretical calculations, a simple model is proposed to illustrate the corresponding gas-sensing mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Liu Yang,Gaoyi Han,Yunzhen Chang,Ying Zhang,Yaoming Xiao
High quality of perovskite film is considered as one of the most important factors on the photovoltaic properties in the perovskite solar cell (PSC). In this work, the magnesium acetate (MgAc 2 ) is first used as an effective additive to prepare high quality perovskite film through a synergistic effect Mg 2+ and Ac − , in which the Mg 2+ can enhance the conversion from PbI 2 to complete perovskite and the Ac − can adjust the crystallization rate to prepare dense and smooth perovskite film. Moreover, the Mg 2+ and Ac − can induce the trap states passivation of lead and iodide ions to reduce the charge recombination, which is critical to keep the high photovoltaic performance of perovskite films. As a result, the PSC with MgAc 2 shows higher efficiency and stability than those of the PSC without MgAc 2 .
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Weidong Zhu,Lei Kang,Tao Yu,Bihu Lv,Yangrunqian Wang,Xingyu Chen,Xiaoyong Wang,Yong Zhou,Zhigang Zou
Herein, we demonstrate that the facile face-down annealing route which effectively confines the evaporation of residual solvent molecules in one-step deposited precursor films can controllably enable the formation of (110) textured CH3NH3PbI3 films consisting of high-crystallinity well-ordered micrometer-sized grains that span vertically the entire film thickness. Such microstructural features dramatically decrease nonradiative recombination sites as well as greatly improve the transport property of charge carries in the films compared with that of the nontextured ones obtained by the conventional annealing route. As a consequence, the planar-heterojunction perovskite solar cells with these textured CH3NH3PbI3 films exhibit significantly enhanced power conversion efficiency (PCE) along with small hysteresis and excellent stability. The champion cell yields impressive PCE boosting to 18.64% and a stabilized value of around 17.22%. Particularly, it can maintain 86% of its initial value after storage for 20 days in ambient conditions with relative humidity of 10–20%. Our work suggests a facile and effective route for further boosting the efficiency and stability of low-cost perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 6
·2754-2763
·
IF 10.733
Jieming Zhen,Weiran Zhou,Muqing Chen,Bairu Li,Lingbo Jia,Mingtai Wang,Shangfeng Yang
Incorporating n-type fullerene derivatives into the perovskite layer affording bulk heterojunction (BHJ) perovskite solar cells (PSCs) is an effective strategy to passivate trap states, consequently reducing the current–voltage hysteresis and improving the device performance. Herein, we report the synthesis of a novel pyridine-functionalized fullerene derivative (C60-PyP) via a 1,3-dipolar cycloaddition reaction, and the unambiguous determination of its molecular structure by X-ray single crystal diffraction. Upon incorporating C60-PyP as an additive with an optimized doping ratio of 0.13 wt% into the CH3NH3Pbl3 (MAPbI3) perovskite precursor, the regular-structure bulk heterojunction PSC devices exhibit a best power conversion efficiency (PCE) of 19.82%, which is dramatically enhanced relative to that of the control devices (17.61%). The C60-PyP additive provides heterogeneous nucleation sites, leading to the decrease of the nucleation Gibbs free energy and consequently enlarged grain size and improved crystallization of the MAPbI3 perovskite film. Besides, incorporation of C60-PyP results in enhanced crystalline orientation as confirmed by grazing-incidence X-ray diffraction (GIXRD) measurements. Meanwhile, the coordination interaction between the N atom of the pyridine moiety within C60-PyP and the Pb2+ ion within MAPbl3 leads to the passivation of the trap states of the perovskite layer, jointly contributing to the improved device performance and markedly suppressed current–voltage hysteresis. Moreover, the ambient stability of the devices is improved upon C60-PyP incorporation due to the hydrophobic nature of the C60-PyP molecule, which presumably resides at the grain boundaries.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2021
·
IF 0
Fei Han,Xi Ping Xi,Min Fan,Ling Ling Wang,Jin Ming Shi,Qin Liang Jiang,Bo Hong Chen,Heng Yan
In the paper, a novel perovskite microcrystalline with a capsule-free cavity box structure was creatively prepared through solvent thermal reaction, and the composition and structure of CH3NH3PbI3 perovskite microcrystalline were further characterized by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) element mapping. The SEM results show that the grain size of the prepared CH3NH3PbI3 perovskite microcrystalline is more than 100 μm. Furthermore, X-ray diffraction (XRD) analysis was used to characterize the material decomposition of perovskite microcrystals before and after 150 d of air aging. The XRD results indicate the prepared perovskite microcrystalline could be stably preserved in the air for 150 d without degradation. Our method provides technical guidance for further enriching the morphology of CH3NH3PbI3 perovskite microcrystalline.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
SOLAR ENERGY
·
2020
·
IF 4.608
Bing Liu,Rongli Cui,Huan Huang,Xihong Guo,Shouwei Zuo,Jinquan Dong,Huanli Yao,Ying Li,Dangui Zhao,Jiahao Wang,Jing Zhang,Yu Chen,Junliang Yang,Baoyun Sun
The crystal structure of perovskite has a significant influence on the photovoltaic performance and stability of perovskite solar cells (PSCs). Pb 4+ is introduced into CH 3 NH 3 PbI 3 (MAPbI 3 )-based PSCs by participating the octahedral [PbI 6 ] 4- structure, then to induce the formation of stronger Pb-I bond and reduce [PbI 6 ] 4- octahedron distortion, which would improve structural symmetry, decrease the degree of disorder and be beneficial to the crystallization of perovskites . Synchrotron based X-ray absorption fine spectroscope (XAFS) revealed that the existence of higher valence state lead could be realized by doping Pb 4+ directly or induced by electron withdrawing group, in consequence the [PbI 6 ] 4- octahedral structure becomes more stable. Grazing incidence X-ray diffraction (GIXRD) especially demonstrates that Pb 4+ with appropriate proportion may well replace part of Pb 2+ to form an uniform phase in the primal perovskite structure to improve the crystallization on the surface and homogeneous out-of-plane (OOP) ordered crystal accumulation in the bulk, which is also important for improving the efficiency and stability of PSCs. As a result, a power conversion efficiency (PCE) exhibits a 42.1% increase with the doping of 0.03% PbF 4 and 0.075% PCBM compared with a pristine device and its stability improves markedly after 30 days of storage in ambient atmosphere.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Bowen Zhang,Fei Cheng,Zeyu Sun,Kunpeng Xing,Bo Zhang,Saisai Zhang,Hari Bala,Yan Wang
Organic-inorganic hybrid perovskite materials have garnered significant research interest owing to their exceptional crystallographic characteristics and remarkable optoelectronic properties. This study presents a breakthrough in room-temperature ammonia sensing through the rational design of CH 3 NH 3 PbI 3 (MAPbI 3 )-based chemiresistive sensors modified with monoethanolamine (MEA) ligands. By integrating MEA as a coordination agent into the perovskite precursor solution, we achieved controlled crystallization dynamics, yielding compact MAPbI 3 films with unique maple-leaf grain morphology and enhanced humidity resistance. The optimized TiO 2 /MEA-MAPbI 3 sensor exhibited a nearly 2.1-fold improvement in response amplitude toward 100 ppm NH 3 compared to unmodified counterparts, alongside exceptional selectivity to NH 3 against interfering gases. Crucially, MEA-derived (PbI 2 )-MEA-(MAI) molecular shielding layers at grain boundaries suppressed moisture-induced degradation, enabling stable operation in air environment (∼30 %RH) with less than 22 % response degradation over 29 days. Mechanistic analyses revealed that the sensing behavior originates from reversible cation exchange between methylammonium (MA + ) and ammonium (NH 4 + ) species at the perovskite surface, corroborated by density functional theory (DFT) calculations showing preferential NH 3 adsorption over other analyte gases.
研究领域:
材料科学
·
化学传感器
·
理论计算
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Zhanfeng Li,Jinbo Chen,Jingkun Ren,Qinjun Sun,Hua Wang,Junsheng Yu,Yuying Hao
Organometal halide perovskite solar cells (PSCs) have demonstrated exceptional, unparalleled progress in solar cell performance by optimizing the perovskite film morphology, composition , interfaces, and charge collection efficiency. In this work, a PbBr 2 pre-coating layer (PCL) was employed to effectively fabricate a relatively uniform composition perovskite film with large crystal sizes and no voids. We demonstrated that carrier recombination is reduced and charge collection is improved by the interface and interior passivation in PSCs fabricated with PCL process, which leads to a striking enhancement in open-circuit voltage and short circuit current. As a result, a promising power conversion efficiency of 17.38%, showing more than 10% enhancement over the reference devices, was realized in the passivated invert planar PSCs with negligible hysteresis and stable photocurrent output. This study gives a novel compositional passivation process to produce high-efficiency halide PSCs with improved process reproducibility.
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
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
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Wang Wen,Zhang Zongbao,Cai Yangyang,Chen Jinshan,Wang Jianming,Huang Riyan,Lu Xubing,Gao Xingsen,Shui Lingling,Wu Sujuan,Liu Jun-Ming
In this work, perovskite solar cells (PSCs) with CH 3 NH 3 PbI 3- x
Cl
x
as active layer and spiro-OMeTAD as hole-transport media have been fabricated by one-step method. The methylammonium iodide (CH 3 NH 3 I) solution with different concentrations is used to modify the interface between mesoporous TiO 2 (meso-TiO 2 ) film and CH 3 NH 3 PbI 3− x
Cl
x
perovskite layer. Several techniques including X-ray diffraction, scanning electron microscopy, optical absorption, electrochemical impedance spectroscopy (EIS) and photoluminescence are used to investigate the effect of the interfacial modification. It is found that the interfacial modification by CH 3 NH 3 I enhance the crystallinity and increase the grain size of CH 3 NH 3 PbI 3− x
Cl
x
layer, and improve the surface wetting properties of perovskite precursor on meso-TiO 2 film. The sunlight absorption and external quantum efficiency of PSCs in the visible region with wavelength less than 600 nm have been improved. The Nyquist plots obtained from the EIS suggest that the CH 3 NH 3 I modification can reduce the charge recombination rates. The photoluminescence measurement shows that the exciton dissociation in the modified devices is more effective than that in the control samples. The photovoltaic performance of the modified devices can be significantly improved with respect to the reference (control) devices. The CH 3 NH 3 I modified devices at the optimized concentration demonstrate the average power conversion efficiency of 12.27 % in comparison with the average efficiency of 9.68 % for the reference devices.
研究领域:
材料科学
·
光伏技术
·
纳米科技
·
表面科学
·
半导体物理
·
能源材料
·
器件物理
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Xiangfeng Wei,Xiaoqian Liu,Han Liu,Shangfeng Yang,Hualing Zeng,Fancheng Meng,Xunyong Lei,Jiehua Liu
In CH 3 NH 3 PbI 3 based perovskite solar cells (PSCs), the subtle pinholes and grain boundaries are hardly avoided in the formation of perovskite film. The defected film often leads to a reduced efficiency due to a larger amount of electron trap sites which induce carrier recombination leading to electron loss. In this work, ultrafine exfoliated graphitic carbon nitride (E-g-C 3 N 4 ) nanoparticles are successfully synthesized by H 2 SO 4 intercalation and NH 3 stripping. The E-g-C 3 N 4 has a lot of N H or O H groups, which could coil into nanoparticles spontaneous from nanosheets by hydrogen bonds. As an application in PSCs , the E-g-C 3 N 4 , as doping materials between MAPbI 3 and the hole transport materials (HTMs), could magically self-recognize CH 3 NH 3 PbI 3 grain boundaries and locate on them. Electron-hole recombination is greatly reduced even after incorporating trace of E-g-C 3 N 4 by decreasing the deep electron trap centers at grain boundaries. As a result, the power conversion efficiency (PCE) of 15.8% is achieved for the MAPbI 3 based PSCs, which is 35% higher than the reference cell. Thus, it is a universal and efficient method to weaken the influence of unavoidable defects existing in pinholes and grain boundaries, and develop the low-cost preparation for large-area PSCs in general conditions.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2020
·Vol. 5
·期 3
·2000621
·
IF 7.527
Yonghui Chen,Xiaoqing Yang,Pengyun Liu,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Organic–inorganic halide perovskite solar cells (PSCs) are a new class of photovoltaic devices, which have attracted increasing interests due to high efficiency, low cost, and simple fabrication process. Although a remarkable enhancement in power conversion efficiency (PCE) has been achieved in the last decade, the stability issue, including high water/heat sensitivity and UV light-induced degradation, has become one of the main obstacles for practical applications of PSCs. Herein, hydrophobic butyl acrylate with CO and CC groups is reported as a new additive to enhance the PCE and moisture/thermal stability of CH 3 NH 3 PbI 3 -based PSCs, which improves the quality of the perovskite film by promoting defect passivation, constructing a suitable energy-level alignment, and increasing the charge carrier lifetime in PSCs. Such an additive is easily introduced into PSCs without the need for thermal treatment, which is typically required by other additives, causing a negative effect on the efficiency. The CH 3 NH 3 PbI 3 -based PSC with butyl acrylate additive shows a superior PCE of 20.0%, 19% higher than that of the unmodified device (16.8%), as well as much improved moisture/thermal stability. Herein, a facile way is provided to enhance the PCE and stability of CH 3 NH 3 PbI 3 -based PSCs simultaneously, which facilitates the commercialization of PSCs.
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
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