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Molecular engineering of s-triazine and its derivatives applied in surface modification strategy for enhancing photoelectric performanc of all-inorganic perovskites

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Chinese Chemical Letters 2022年第1期33卷 547-550页

作者： Yifei Yue Shengnan Liu Ning Zhang Zhongmin Su Dongxia Zhu Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province Department of ChemistryNortheast Normal UniversityChangchun 130024China

We develop the effective modification strategy based on molecular engineering of s-triazine and its derivatives to improve the photoelectric performance of all-inorganic perovskites(AIP)for the first *** surface modification strategy with cyanuric acid successfully increases the PLQY of AIP from 40.55%to 88.15%,and significantly enhances the current of the AIP film under 3 V by almost 20-fold(from4.44 m A to 81.20 m A).This work has proven the effectiveness of improving the photoelectric performances of AIP via s-triazine and its derivatives and also suggested the potential risks of reducing the photoelectric performance of AIP due to inappropriate substituents in conjugated organic ligands.

关键词： All-inorganic perovskites Surface modification s-Triazine Substituents photoelectric performance

Optical and electrical properties of room temperature preparedα-IGZO thin films using an In_(2)Ga_(2)ZnO_(7) ceramic target

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Journal of Central South University 2022年第4期29卷 1062-1074页

作者： ZHANG Yu CHEN Jie SUN Ben-shuang LIU Shuai WANG Zhi-jun LIU Shu-han SHU Yong-chun HE Ji-lin School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China College of Sciences Xi’an Shiyou UniversityXi’an 710065China State Key Laboratory of Special Rare Metal Materials Northwest Rare Metal Materials Research InstituteShizuishan 753000China

In this study,a high-purity In_(2)Ga_(2)ZnO_(7) ceramic target was used to deposit indium gallium zinc oxide(IGZO)films by RF magnetron sputtering *** microstructure,growth state,optical and electrical properties of the IGZO films were *** results showed that the surface of the IGZO film was uniform and smooth at room *** the substrate temperature increased,the surface roughness of the film gradually *** room temperature to 300℃,all the films maintained amorphous phase and good thermal ***,the transmission in the visible region decreased from 91.93%to 91.08%,and the band gap slightly decreased from 3.79 to 3.76 *** characterization of the film via atomic force microscope(AFM)and X-ray photoelectron spectroscopy(XPS)demonstrated that the film prepared at room temperature exhibited the lowest surface roughness and the largest content of oxygen *** the rise in temperature,the non-homogeneous particle distribution,increase in the surface roughness,and reduction in the number of oxygen vacancies resulted in lower performance of theα-IGZO *** analysis showed that the best optical and electrical properties can be obtained by depositing IGZO films at room temperature,which indicates their potential applications in flexible substrates.

关键词： oxide ceramic sputtering film microstructure photoelectric performance

Enhanced Crystal Quality of Perovskite via Protonated Graphitic Carbon Nitride Added in Carbon-Based Perovskite Solar Cells

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Chinese Journal of Chemical Physics 2022年第2期35卷 390-398,I0004页

作者： Mingxing Guo Wenchao Liu Junyan Huang Jiaqi Liu Shuhui Yin Jing Leng College of Environment Science and Engineering Dalian Maritime UniversityDalian 116026China College of Science Dalian Maritime UniversityDalian 116026China The State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116026China

The quality of perovskite layers has a great impact on the performance of perovskite solar cells(PSCs).However,defects and related trap sites are generated inevitably in the solutionprocessed polycrystalline perovskite *** is meaningful to reduce and passivate the defect states by incorporating additive into the perovskite layer to improve perovskite *** an environmental friendly 2D nanomaterial protonated graphitic carbon nitride(p-g-C_(3)N_(4))was successfully synthesized and doped into perovskite layer of carbon-based *** addition of p-g-C_(3)N_(4)into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide(MAPb I3)crystal for obtaining flat perovskite surface with larger grain size,but also reduces intrinsic defects of perovskite *** is found that thep-g-C_(3)N_(4) locates at the perovskite core,and the active groups-NH_(2)/NH_(3)and NH have a hydrogen bond strengthening,which effectively passivates electron traps and enhances the crystal quality of *** a result,a higher power conversion efficiency of 6.61% is achieved,compared with that doped with g-C_(3)N_(4)(5.93%)and undoped one(4.48%).This work demonstrates a simple method to modify the perovskite film by doping new modified additives and develops a low-cost preparation for carbon-based PSCs.

关键词： Perovskite solar cell Carbon counter electrode p-g-C3N4 Crystal quality photoelectric performance