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Applications of metal-semiconductor phase transition in 2D layered transition metal dichalcogenides Suyeon Cho, Sera Kim, Jinbong Seok, Heejun Yang Motivated by two dimensional graphene, layered

1 Applications of metal-semiconductor phase transition in 2D layered transition metal dichalcogenides Suyeon Cho, Sera Kim, Jinbong Seok, Heejun Yang Motivated by two dimensional graphene, layered transition metal dichalcogenides (TMDs) have attracted scientific interests by their diverse electronic, optical and catalytic properties. In particular, group 6 TMDs such as MoS 2 and MoTe 2 have polymorphs (with metallic octahedral and semiconducting hexagonal phases) which are not present in graphene. Here, we introduce a new concept in 2D materials' studies, structural phase transition, with group 6 TMDs and its current research trend and applications for electric device and electrochemical catalyst. 전이금속칼코젠화합물의반도체연구동향 4

$diffraction patterns.$

2 [Fig. 1] 2H phase (left) and 1T phase (right) in TMDs 전이금속칼코겐화합물의다양한구조와물리적인성질 [Fig. 2] High quality single crystals with two different phases (2H and 1T'). 2H and 1T'-MoTe 2 show different atomic arrangements by X-ray diffraction patterns. Large-sized single crystals are shown in the picture with scale bar. 5

3 [Fig. 3] The schematics for the structural phase transition between semiconducting and metal in MoTe 2. 전이금속칼코겐화합물의구조상전이 레이저조사를이용한동종접합소자 6

TEM images show that Te vacancy triggers the

4 [Fig. 4] Phase patterning for ohmic homojuction with semiconducting 2H and metallic 1T' phase in MoTe 2. TEM images show that Te vacancy triggers the structural phase transition. 신재생에너지자원인수소생산을위한물분해전기화학촉매로써의 2 차원물질응용 7

5 References [Fig. 5] PHER activities of exfoliated MoS 2 nanosheets. Corresponding Tafel plots (right) obtained from the polarization curves (left). Tafel slopes of ~ 40 and mv/dec have been measured for 1T and 2H MoS 2, respectively(right). 맺음말 [1] Y. Zhang, Y.-W. Tan, H.L. Stormer, and P. Kim, Nature, 438, 201 (2005). [2] R uppert, C., Aslan, O. B., and Heinz, T. F. Nano Lett. 14, 6231 (2014). [3] D. W. Shen, B. P. Xie, J. F. Zhao, L. X. Yang, L. Fang, J. Shi, R. H. He, D. H. Lu, H. H. Wen, and D. L. Feng, Phys. Rev. Lett. 99, (2007). [4] X. Qian, J. Liu, L. Fu, and J. Li. Science 346, 1344 (2014). [5] Damien Voiry, Hisato Yamaguchi, Junwen Li, Rafael Silva, Diego C. B. Alves, Takeshi Fujita, Mingwei Chen, Tewodros Asefa, Vivek B. Shenoy, Goki Eda and Manish Chhowalla Nature Materials 12, 850 (2013). [6] Nihar R. Pradhan, Daniel Rhodes, Simin Feng, Yan Xin, Shahriar Memaran, Byoung-Hee Moon, Humberto Terrones, Mauricio Terrones, and Luis Balicas ACS Nano 8, 5911 (2014). [7] K.-A. N. Duerloo, Y. Li, and E. J. Reed, Nat. Comm. 5, 4214 (2014). [8] Dong Hoon Keum, Suyeon Cho, Jung Ho Kim, Duk-Hyun Choe, Ha- Jun Sung, Min Kan, Haeyong Kang, Jae-Yeol Hwang, Sung Wng Kim, Heejun Yang, K. J. Chang & Young Hee Lee, Nature Physics 11, 482 (2015). [9] Andrey N. Enyashin, Lena Yadgarov, Lothar Houben, Igor Popov, Marc Weidenbach, Reshef Tenne, Maya Bar-Sadan, and Gotthard Seifert, J. Phys. Chem. C 115, (2011). [10] Yimin Kang, Sina Najmaei, Zheng Liu, Yanjun Bao, Yumin Wang, Xing Zhu, Naomi J. Halas, Peter Nordlander, Pulickel M. Ajayan, Jun Lou, Zheyu Fang, Advanced Materials 26, 6467 (2014). [11] Suyeon Cho, Sera Kim, Jung Ho Kim, Jiong Zhao, Jinbong Seok, Dong Hoon Keum, Jaeyoon Baik, Duk-Hyun Choe, K. J. Chang, Kazu Suenaga, Sung Wng Kim, Young Hee Lee, and Heejun Yang, Science 349, 625 (2015). [12] Seunghyun Song, Dong Hoon Keum, Suyeon Cho, David Perello, Yunseok Kim, and Young Hee Lee, Nano Lett., 16, 188 (2016) [13] L. Wang, I. Meric, P. Y. Huang, Q. Gao, Y. Gao, H. Tran, T. Taniguchi, K. Watanabe, L. M. Campos, D. A. Muller, J. Guo, P. Kim, J. Hone, K. L. Shepard, and C. R. Dean, Science, 342, 614 (2013). [14] Rajesh Kappera, Damien Voiry, Sibel Ebru Yalcin, Brittany Branch, Gautam Gupta, Aditya D. Mohite and Manish Chhowalla, Nature Mat. 13, 1128 (2014). [15] Damien Voiry, Maryam Salehi, Rafael Silva, Takeshi Fujita, Mingwei Chen, Tewodros Asefa, Vivek B. Shenoy, Goki Eda, and Manish Chhowalla, Nano letters, 13, 6222 (2013). [16] Thomas F. Jaramillo, Kristina P. Jørgensen, Jacob Bonde, Jane H. Nielsen, Sebastian Horch, Ib Chorkendorff, Science, 317, 100 (2007). [17] Jesse D. Benck, Thomas R. Hellstern, Jakob Kibsgaard, Pongkarn Chakthranont, and Thomas F. Jaramillo, ACS Catal., 4, 3957 (2014). 8

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