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Transmission-mode GaN photocathode based on graded Al_xGa_(1-x)N buffer layer

Chinese Optics Letters 2011年第1期9卷 17-20页

作者：杜晓晴常本康钱芸生高频 Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education of China College of Optoelectronic EngineeringChongqing University Institute of Electronic Engineering and Opto-Electric Technology Nanjing University of Science and Technology

We create a GaN photocathode based on graded AlxGa1-xN buffer layers to overcome the influence of buffer-emission layer interface on the photoemission of transmission-mode GaN photocathodes. A gate- shaped spectral response with a 260-nm starting wavelength and a 375-nm cut-off wavelength is obtained. Average quantum efficiency is 15% and short wavelength responses are almost equivalent to long wavelength ones. The fitted interface recombination velocity is 5×10^4 cm/s, with negligible magnitude, proving that the design of the graded buffer layers is efficient in obtaining good interface quality between the buffer and the emission laver.

关键词： Buffer layers Epitaxial layers Field emission cathodes Gallium nitride Optical waveguides photocathodes

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High-performance bulk heterojunction-based photocathode with facile architecture for photoelectrochemical water splitting

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Chinese Chemical Letters 2023年第1期34卷 182-186页

作者： Yanling Wu Deyu Liu Huanglong Zhuang Jiabo Le Yongbo Kuang Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Fujian Provincial Key Laboratory of Featured Biochemical and Chemical Materials Ningde Normal UniversityNingde 352100China

Organic semiconductors are promising candidates as photoactive layers for photoelectrodes used in photoelectrochemical(PEC)cells due to their excellent light absorption and efficient charge transport properties with the help of interfacial ***,the use of multilayers will make the charge transfer mechanism more complicated and decrease the PEC performance of the photoelectrode caused by the increased contact *** this work,a PM6:Y6 bulk heterojunction(BHJ)-based photocathode is fabricated for efficient PEC hydrogen evolution reaction(HER)in an acidic aqueous *** RuO_(2)as an interfacial modification layer,the photocathode with a simple structure(fluorine-doped tin oxide(FTO)/PM6:Y6/RuO_(2))generates a maximum photocurrent density up to-15 m A/cm^(2)at 0 V *** hydrogen electrode(RHE),outperforming all previously reported BHJ-based photocathodes in terms of PEC *** highest ratiometric power-saved efficiency of 3.7%is achieved at 0.4 V ***.

关键词： photocathodes Ruthenium oxide Bulk heterojunctions Hydrogen evolution Photoelectrochemical cells

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