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Guo Y, Zhao D, Yu M, Liu M, Zhang Y, Zheng Z. A simple strategy to obtain graphitic carbon nitride modified TiO 2layer for efficient perovskite solar cells. NANOTECHNOLOGY 2023; 35:075201. [PMID: 37972403 DOI: 10.1088/1361-6528/ad0d21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 11/15/2023] [Indexed: 11/19/2023]
Abstract
The power conversion efficiency (PCE) of perovskite solar cells (PSCs) can be improved through the concurrent strategies of enhancing charge transfer and passivating defects. Graphite carbon nitride (g-C3N4) has been demonstrated as a promising modifier for optimizing energy level alignment and reducing defect density in PSCs. However, its preparation process can be complicated. A simple one-step calcination approach was used in this study to prepare g-C3N4-modified TiO2via the incorporation of urea into the TiO2precursor. This modification simultaneously tunes the energy level alignment and passivates interface defects. The comprehensive research confirms that the addition of moderate amounts of g-C3N4to TiO2results in an ideal alignment of energy levels with perovskite, thereby enhancing the ability to separate and transfer charges. Additionally, the g-C3N4-modified perovskite films exhibit an increase in grain size and crystallinity, which reduces intrinsic defects density and extends charge recombination time. Therefore, the g-C3N4-modified PSC achieves a champion PCE of 20.00%, higher than that of the control PSC (17.15%). Our study provides a systematic comprehension of the interfacial engineering strategy and offers new insights into the development of high-performance PSCs.
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Affiliation(s)
- Yanru Guo
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, People's Republic of China
| | - Dandan Zhao
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, People's Republic of China
| | - Man Yu
- School of Materials Engineering, Xi'an Aeronautical University, Xi'an 710077, People's Republic of China
| | - Manying Liu
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, People's Republic of China
| | - Yange Zhang
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, People's Republic of China
| | - Zhi Zheng
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, People's Republic of China
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Lin Z. Extension of in-gap electronic-state spectrum extraction method based on transient photo-voltage measurement. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Li G, Zhang Y, Lin J, Xu X, Liu S, Fang J, Jing C, Chu J. Anomalous NH 3-Induced Resistance Enhancement in Halide Perovskite MAPbI 3 Film and Gas Sensing Performance. J Phys Chem Lett 2021; 12:11339-11345. [PMID: 34780179 DOI: 10.1021/acs.jpclett.1c03226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Despite the growing interest in halide perovskite-based NH3 sensors, the NH3 sensing mechanism is still not well understood. Here, we report an anomalous behavior of resistance enhancement in CH3NH3PbI3(MAPbI3) perovskite films upon exposure to NH3 gas, which is contrary to a resistance drop trend in previously reported perovskites. We propose a NH3 sensing mechanism in which the anomalous resistance enhancement is dominated by grain boundaries of perovskites. It is demonstrated that NH3 molecules can substitute MA+ cations of MAPbI3 to form the insulating NH4PbI3·MA intermediate layers onto the surface of crystal grains, thereby resulting in an increase of resistance. Additionally, we construct the MAPbI3-based sensor, and achieve a gas response of 472% toward 30 ppm of NH3. This study suggests the potential of the perovskite-based NH3 sensors, and also provides guidance for developing high-performance sensing perovskite materials.
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Affiliation(s)
- Guishun Li
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Yu Zhang
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Jianqiu Lin
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Xionghu Xu
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Shaohua Liu
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Junfeng Fang
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Chengbin Jing
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Junhao Chu
- Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education; Key Laboratory of Polar Materials and Devices (Ministry of Education); Department of Materials; School of Physics and Electronic Science, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
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Ali MS, Das S, Abed YF, Basith MA. Lead-free CsSnCl 3 perovskite nanocrystals: rapid synthesis, experimental characterization and DFT simulations. Phys Chem Chem Phys 2021; 23:22184-22198. [PMID: 34581716 DOI: 10.1039/d1cp02666f] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lead-free metal halide perovskites have attracted great attention as light harvesters due to their promising optoelectronic and photovoltaic properties. In this investigation, we have successfully synthesized thermally stable cubic phase cesium tin chloride (CsSnCl3) perovskite nanocrystals with improved surface morphology by adopting a rapid hot-injection technique. The excellent crystalline quality of these cubic shaped nanocrystals was confirmed by high-resolution transmission electron microscopy imaging. The binding of organic ligands on the surface of the sample was identified and characterized using nuclear magnetic resonance spectroscopy. UV-visible spectroscopy confirmed that the CsSnCl3 nanocrystals have a direct band gap of ∼2.98 eV, which was further confirmed using steady-state photoluminescence spectroscopy. The band edge positions calculated using the Mulliken electronegativity approach predicted the potential photocatalytic capability of the as-prepared nanocrystals, which was then experimentally corroborated through the photodegradation of rhodamine-B dye under both visible and UV-visible irradiation. Our theoretical calculations employing experimentally obtained structural parameters within the generalized gradient approximation (GGA) and GGA+U methods demonstrated a 90% accurate estimation of the experimentally observed optical band gap when Ueff = 6 eV was considered. The ratio of the effective mass of the hole and electron expressed as was also calculated for Ueff = 6 eV. Based on this theoretical calculation and experimental observation of the photocatalytic performance of CsSnCl3 nanocrystals, we have proposed a rational interpretation of the "D" value. We think that a "D" value of either much smaller or much larger than 1 is an indication of the low recombination rate of the photogenerated electron-hole pairs and the high photocatalytic efficiency of the photocatalyst. We believe that this comprehensive investigation might be helpful for the large-scale synthesis of thermally stable cubic CsSnCl3 nanocrystals and also for a greater understanding of their potential in photocatalytic, photovoltaic and other prominent optoelectronic applications.
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Affiliation(s)
- Md Shahjahan Ali
- Nanotechnology Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
| | - Subrata Das
- Nanotechnology Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
| | - Yasir Fatha Abed
- Nanotechnology Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
| | - M A Basith
- Nanotechnology Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
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