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Transition metal oxides as hole-transporting materials in organic semiconductor and hybrid perovskite based solar cells

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Science china chemistry 2017年第4期60卷 472-489页

作者： Pingli Qin Qin he Dan Ouyang Guojia Fang wallace c.h. choy Gang Li Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Hum Kowloon Hong Kong SAR China School of Science Wuhan Institute of Technology Wuhan 430073 China college of Post and Telecommunications Wuhan Institute of Technology Wuhan 430073 China Key Laboratory of Artificial Micro- and Nano-struetures of the Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong SAR China

Organic polymer solar cells （OScs） and organic-inorganic.h.brid perovskite solar cells （PScs） have achieved notable progress over the past several years. A central topic in these fields is exploring electronically efficient, stable and effective hole-transporting layer （hTL） materials. The goal is to enhance hole-collection ability, reduce charge recombination, increase built-in voltage, and hence improve the performance as well as the device stability. Transition metal oxides （TMOs） semiconductors such as NiOx, cuOx, crOx, MoOx, WO3, and V2O5, have been widely used as hTLs in OScs. These TMOs are naturally adopted into PSc as hTLs and shows their importance. There are similarities, and also differences in applying TMOs in these two types of main solution processed solar cells. This concise review is on the recent developments of transition metal oxide hTL in OScs and PScs. The paper starts from the discussion of the cation valence and electronic structure of the transition metal oxide materials, followed by analyzing the structure-property relationships of these hTLs, which we attempt to give a systematic introduction about the influences of their cation valence, electronic structure, work ftmction and film property on device performance.

关键词： hole-transporting layer transition metal oxide perovskite solar cell organic solar cell

Efficient and stable hybrid perovskite-organic light-emitting diodes with external quantum efficiency exceeding 40 per cent

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Light(Science & Applications) 2024年第7期13卷 1364-1371页

作者： Lingmei Kong Yun Luo Qianqian Wu Xiangtian Xiao Yuanzhi Wang Guo chen Jianhua Zhang Kai Wang wallace chchoy Yong-Biao Zhao hongbo Li Takayuki chiba Junji Kido Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China. Institute of Nanoscience and Applications Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China. Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina. Department of Physics and Lakeside AR/VR Laboratory International Joint Research Center for Optoelectronic and Engineering ResearchYunnan UniversityKunming 650091China. Experimental center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China. Graduate School of Organic Materials Science Frontier Center for Organic MaterialsYamagata University4-3-16 JonanYonezawa 992–8510Japan

Light-emitting diodes(LEDs)based on perovskite semiconductor materials with tunable emission wavelength in visible light range as well as narrow linewidth are potential competitors among current light-emitting display technologies,but still suffer from severe instability driven by electric ***,we develop a stable,efficient and highcolor purity hybrid LED with a tandem structure by combining the perovskite LED and the commercial organic LED technologies to accelerate the practical application of *** LED and organic LED with close photoluminescence peak are selected to maximize photon emission without photon reabsorption and to achieve the narrowed emission *** designing an efficient interconnecting layer with p-type interface doping that provides good opto-electric coupling and reduces Joule heating,the resulting green emitting hybrid LED shows a narrow linewidth of around 30 nm,a peak luminance of over 176,000 cd m^(−2),a maximum external quantum efficiency of over 40%,and an operational half-lifetime of over 42,000 h.

关键词： diodes narrow quantum

Metallated conjugation in small-sized-molecular donors for solution-processed organic solar cells

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Science china chemistry 2015年第2期58卷 347-356页

作者： chaohua cui Yunye Zhang wallace c.h.choy hua Li Wai-Yeung Wong Institute of Molecular Functional Materials Department of Chemistry and Institute of Advanced Materials Hong Kong Baptist University Department of Electrical and Electronic Engineering The University of Hong Kong college of Life and Environmental Sciences & Beijing Engineering Research center of Food Environment and Public.h.alth Minzu University of China hKBU Institute of Research and continuing Education Shenzhen Virtual University Park

Four metallated conjugated oligothiophenes, S-1, S-2, S-3 and S-4, with platinum（II） aryleneethynylenes as the electron-rich building block were synthesized to investigate their physicochemical and photovoltaic properties. These small molecules possess fairly low-lying hOMO energy levels which match with the LUMO energy level of the electron acceptor Pc70BM （[6,6]-phenyl-c71-butyric acid methyl ester）. Using the simple process of spin-coating solution fabrication technique, S-I：Pc70BM （1：4, w/w） based organic solar cells exhibiting a high Voc of 0.913 V, with a PcE value of 0.88% were developed. In contrast, the OSc device based on S-2：Pc70BM （3：7, w/w） displayed a higher PcE of 1.59% with a higher Jsc value of 5.89 mA cm^-2. The device based on S-4：PcToBM （1：4, w/w） exhibited a PcE value of 1.56%, with a Voc of 0.917 V.

关键词： platinum acetylide photovoltaics organic solar cell oligothiophene

Two-dimensional like conjugated copolymers for high efficiency bulk-heterojunction solar cell application:Band gap and energy level engineering

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Science china chemistry 2011年第4期54卷 685-694页

作者： DUAN chunhui WANG chuanDao LIU ShengJian hUANG Fei choy c.h.wallace cAO Yong Institute of Polymer Optoelectronic Materials & Devices Key Laboratory of Specially Functional Materials of the Ministry of Education South china University of Technology Guangzhou 510640China Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongChina

Three two-dimensional like conjugated copolymers PFSDcN,PFSDTA and PFSDcNIO,which consist of alternating fluorene and triphenylamine main chain,and different pendant acceptor groups (malononitrile,1,3-diethtyl-2-thiobarbituric acid and 2-(1,2-dihydro-1-oxoinden-3-ylidene)malononitrile) with thiophene as π-bridge,have been designed,synthesized and *** structure-property relationships of the two-dimensional like conjugated copolymers were systematically *** absorption spectra,band gaps,and energy levels of the polymers were effectively tuned by simply attaching different acceptor *** the electron-withdrawing ability of the acceptors increased,the band gaps of the polymers were narrowed from 2.05 to 1.61 eV;meanwhile,the LUMO energy levels of the polymers decreased from -3.27 to -3.75 eV,whereas their relatively deep hOMO energy levels of ～-5.35 eV were *** solar cells were fabricated and characterized by using the three polymers as donor materials and the highest power conversion efficiency of 2.87% was achieved for the device based on PFSDTA:(6,6)-phenyl-c71-butyric acid methyl ester blend.

关键词： conjugated polymers two-dimensional like polymers band gaps bulk-heterojunction solar cells

high-Performance Blue Quasi-2D Perovskite Light-Emitting Diodes via Balanced carrier confinement and Transfer

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Nano-Micro Letters 2022年第4期14卷 207-221页

作者： Zhenwei Ren Jiayun Sun Jiahao Yu Xiangtian Xiao Zhaojin Wang Ruijia Zhang Kai Wang Rui chen Yu chen wallace c.h.choy Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongPeople’s Republic of China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Optoelectronic Science and Engineering Soochow UniversitySuzhou 215006People’s Republic of China Guangdong-hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Shenzhen 518055People’s Republic of China

Extensive investigation of the passivating agents has been performed to suppress the perovskite ***,very few attentions have been paid to rationally design the passivating agents for the balance of the carrier confinement and transfer in quasi-2D perovskites,which is essential to achieve high-performance perovskite LEDs(PeLEDs).In this work,tributylphosphine oxide(TBPO)with moderate carbon chain length is demonstrated as a decent passivator for the quasi-2D perovskites by strengthening the carrier confinement for massive radiative recombination within the perovskites,and more importantly providing efficient carrier transfer in the quasi-2D *** from these interesting optoelectronic properties of TBPO-incorporated perovskites,we achieve high-efficient blue PeLEDs with an external quantum efficiency up to 11.5%and operational stability as long as 41.1 min without any shift of the electroluminescence ***,this work contributes an effective approach to promote the carrier confinement and transfer for high-performance and stable blue PeLEDs.

关键词： Blue perovskite LEDs carrier confinement and transfer Defect passivation 2-Dimentional

A Systematic Study for the Plasmonic Thin-film Solar cell with Periodic Structure

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A Systematic Study for the Plasmonic Thin-film Solar Cell wi...

OLEDs with high Performance by using Semitransparent Metallic Multilayered Structures and Nanoparticles as the connecting Electrodes

全国第八届有机固体电子过程暨华人有机光电功能材料学术讨论会

作者： wallace c.h.choy Department of Electrical and Electronic Engineering the University of Hong KongPokfulam RoadHong Kong

A systematic study of the plasmonic thin-film solar cell with the periodic strip structure is presented in this paper. The finite-difference frequency-domain method is employed to discretize the inhomogeneous wave function for modeling the solar *** particular,the hybrid absorbing boundary condition and the one-sided difference scheme are *** parameter extraction methods for the zero-order reflectance and the absorbed power density are al-

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OLEDs with High Performance by using Semitransparent Metalli...

Study on the pyroelectric properties of PLT/P(VDF-TrFE) nanocomposites

全国第八届有机固体电子过程暨华人有机光电功能材料学术讨论会

作者： wallace c.h.choy Department of Electrical and Electronic Engineering University of Hong Kong

Semitransparent metallic structures are very useful for OLED *** stacked OLEDs,the intermediate connection layer plays critical role in modifying the device *** the independently controllable stacked OLEDs,the interme...

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chinese Science Bulletin 1998年第2期43卷 111-114页

作者： Qingqi Zhang h. L. W. chan Qifa Zhou c. L. choy hong Kong Polytech Univ Dept Appl Phys Hung Hom Hong Kong hong Kong Polytech Univ Mat Res Ctr Hung Hom Hong Kong

Lead lanthanum titanate (PLT) nanocrystalline powder prepared by the sol_gel process was incorporated into a polyvinylidene fluoride/trifluoroethylene (P(VDF_TrEF)) copolymer matrix to form PLT/P(VDF_TrFE) nanocomposites. The permittivities (ε) of the nanocomposites as a function of volume fraction of ceramic  were modeled using the Bruggeman model. The pyroelectric coefficients (p) and figure of merit (p/ε) were measured as functions of the poling field E. The nanocomposite has p and p/ε values higher than those of the copolymer, and has good potential in pyroelectric applications.

关键词： nanocomposites pyroelectric.

high-Performance Organic Solar cells with Broadband Absorption

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High-Performance Organic Solar Cells with Broadband Absorpti...