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Improvement on the performance of perovskite solar cells by doctor-blade coating under ambient condition with hole-transporting material optimization

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Journal of Energy Chemistry 2019年第11期28卷 207-213页

作者： Deng Wang Jiming Zheng Xingzhu Wang Jishu Gao Weiguang Kong Chun Cheng Baomin Xu Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina Academy for Advanced Interdisciplinary Research Southern University of Science and TechnologyShenzhen 518055GuangdongChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Numerous fabrication methods have been developed for high-efficiency perovskite solar cells(PSCs). However, these are limited to spin-coating processes in a glove box and are yet to be commercialized. Therefore, there is a need to develop a controllable and scalable deposition technique that can be carried out under ambient conditions. Even though the doctor-blade coating technique has been widely used to prepare PSCs, it is yet to be applied to high-efficiency PSCs under ambient conditions(RH ~45%, RT ~25 °C). In this study, we conducted blade-coating fabrication of modified high-efficiency PSCs under such conditions. We controlled the substrate temperature to ensure phase transition of perovskite and added dimethyl sulfoxide(DMSO) to the perovskite precursor solution to delay crystallization, which can facilitate the formation of uniform perovskite films by doctor-blade coating. The as-prepared perovskite films had large crystal domains measuring up to 100 μm. Solar cells prepared from these films exhibited a current density that was enhanced from 17.22 to 19.98 m A/cm^2 and an efficiency that was increased from 10.98% to 13.83%. However, the open-circuit voltage was only 0.908 V, probably due to issues with the hole-transporting layer. Subsequently, we replaced poly(3,4-ethylenedioxythiophene) polystyrene sulfonate(PEDOT:PSS) with Ni O x as the hole-transporting material and then prepared higher-quality perovskite films by blade-coating under ambient conditions. The as-prepared perovskite films were preferably orientated and had large crystal domains measuring up to 200 μm;The open-circuit voltage of the resulting PSCs was enhanced from 0.908 to 1.123 V, while the efficiency increased from 13.83% to 15.34%.

关键词： hole-transporting material NiOx Perovskite solar cells Thermally assisted blade-coating Ambient condition Fabrication

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Synthesis, Crystal Structure and Photophysical Properties of a Novel Molecule Containing a Triarylamine and an Oxadiazole Units

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Chinese Journal of Chemistry 2002年第10期20卷 1060-1064页

作者：于海涛张万轩白东仁孟继本 Department of Chemistry Nankai University Tianjin 300071 China

N,N-Di-p-tolylaminophenyl)ethenyl]phenyl}-5-(4-bromophenyl)- 1,3,4-oxadiazole (1) containing triarylamine and 2,5-diaryl-1,3,4-oxadiazole units was prepared by Horner-Witting reactions. The structure of the compound was confirmed by 1H NMR, IR, MS and elemental analyses. The crystal structure of 1 was determined by X-ray diffraction analysis. UV absorption spectra and photoluminescent spectra were measured.

关键词： synthesis triarylamine oxadiazole crystal structure electron-transport hole-transporting

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Mo5+ doping induced interface polarization for improving performance of planar perovskite solar cells

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Journal of Semiconductors 2020年第5期41卷 78-85,105-106页

作者： Yurong Jiang Yue Yang Yiting Liu Shan Yan Yanxing Feng Congxin Xia School of Physics Henan Key Laboratory of Photovoltaic MaterialsHenan Normal UniversityXinxiang 453007China

In this paper,we investigate how interface-induced polarization affects the photovoltaic performance of hybrid perovskite solar cell(PSC)devices.The polarization of the hole transport layer(HTL)is regulated through incorporating metalliclike Mo Ox into PEDOT:PSS.The common Mo O3 doped into PEDOT:PSS is used as a reference,and the device that used PEDOT:PSS-Mo Ox as the HTL shows an enhanced Jsc and FF compared to the reference device.The open-circuit photovoltage decay and impedance spectroscopy measurements indicate that trap-assisted recombination is effectively suppressed at the interface between the hybrid perovskite and the PEDOT:PSS-Mo Ox HTL,while severe trap assisted recombination takes place at the perovskite/PEDOT:PSS and perovskite/PEDOT:PSS-Mo O3 interface.We attribute these experimental findings to the fact that the incorporation of metallic-like Mo5+into PEDOT:PSS enhances the conductivity of HTL and the interface polarization between PEDTOT:PSS layer and perovskite,which helps to induce an interface polarization electric field to facilitate separation of charges and screen the recombination between the traps and free charges.

关键词： conductivity hole-transporting layer dielectric constant polarization

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