{"id":1093,"date":"2016-10-06T10:37:47","date_gmt":"2016-10-06T10:37:47","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=1093"},"modified":"2019-11-06T10:39:03","modified_gmt":"2019-11-06T10:39:03","slug":"high-photoconductivity-from-hybrid-bilayer","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2016\/10\/high-photoconductivity-from-hybrid-bilayer\/","title":{"rendered":"High photoconductivity from hybrid bilayer"},"content":{"rendered":"<p> <\/p>\n<p>6\u00a0Oct\u00a02016. NUS physicists have developed a high performance photodetector built on ahybrid bilayer of tungsten diselenide (WSe<sub>2<\/sub>) and perovskite.<\/p>\n<p>WSe<sub>2<\/sub> is a new class of two-dimensional (2D) material with potential applications for novel optoelectronic devices. However, the intrinsic defects caused by the selenium vacancies lower the electrical conductivity and photoconductivity of the WSe<sub>2<\/sub> monolayer, restricting its use in various applications. Recently, many research activities have been carried out by various international research groups to \u201cheal\u201d these defects in the WSe<sub>2<\/sub> monolayers.<\/p>\n<p>A team led by Prof Chorng Haur SOW, from the Department of Physics, NUS has developed a method to \u201cheal\u201d the defects present in the WSe<sub>2<\/sub> monolayers. They developed effective methods for enhancing the performance of a WSe<sub>2<\/sub> monolayer photodetector using laser tailoring and perovskite functionalisation.<\/p>\n<p>The team deposited a thin layer of organolead halide perovskite (CH<sub>3<\/sub>NH<sub>3<\/sub>PbI<sub>3<\/sub>) via thermal evaporation onto a specially prepared WSe<sub>2<\/sub> monolayer. The unique combination of the focused laser beam technique to heal the defects in WSe<sub>2<\/sub>, together with the use of the large absorption coefficient material CH<sub>3<\/sub>NH<sub>3<\/sub>PbI<sub>3<\/sub>, led to the development of a high performance hybrid bilayer photodetector with an enhanced output which is three orders of magnitude better than the pristine device.<\/p>\n<p>This carefully engineered approach represents a significant step towards improving the performance of 2D optoelectronics, extending the applications of 2D semiconductors in optical communication, integrated micro\/nano-circuits, quantum information technology etc.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" alt=\"39. Sow CH PHY 20160908 1\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2019\/11\/39._Sow_CH_PHY_20160908_1.jpg\" width=\"638\" height=\"291\" \/><\/p>\n<p>Figure shows the schematic diagram of a hybrid bilayer photodetector (left) and atomic structure of the interface of WSe<sub>2<\/sub>\u2013CH<sub>3<\/sub>NH<sub>3<\/sub>PbI<sub>3<\/sub>.<\/p>\n<p> <\/p>\n<p><strong>References<\/strong><\/p>\n<p>JP Lu, A Carvalho, HW Liu, SX Lim, ZL AH Castro Neto, CH Sow. \u201cHybrid Bilayer WSe<sub>2<\/sub>-CH<sub>3<\/sub>NH<sub>3<\/sub>PbI<sub>3<\/sub> Organolead Halide Perovskite as High Performance Photodetector\u201d, Angewandte Chemie, 128, 12124-12128 (2016). DOI: 10.1002\/anie.201603557.<\/p>\n<p>JP Lu, A. Carvalho, XK Chan, HW Liu, B Liu,\u00a0 ES Tok, KP Loh, AHC Castro Neto, CH Sow. \u201cAtomic Healing of Defects in Transition Metal Dichalcogenides\u201d. Nano Lett. 15, 3524 (2015).<\/p>\n","protected":false},"excerpt":{"rendered":"<p> 6\u00a0Oct\u00a02016. NUS physicists have developed a high performance photodetector built on ahybrid bilayer of tungsten diselenide (WSe2) and perovskite….<\/p>\n","protected":false},"author":1,"featured_media":1094,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23,13],"tags":[],"class_list":["post-1093","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-materials","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>High photoconductivity from hybrid bilayer - NUS Faculty of Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.science.nus.edu.sg\/blog\/2016\/10\/high-photoconductivity-from-hybrid-bilayer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"High photoconductivity from hybrid bilayer\" \/>\n<meta property=\"og:description\" content=\" 6\u00a0Oct\u00a02016. 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