Low dimensional materials exhibit promising electrical properties, which make them appealing as the next generation of electronic devices. However, two major obstacles prevent these low dimensional electronic devices from being realized. On one hand, the large area single crystalline growth, which makes it hard to have reliable devices. Another issue is the large and intrinsic Schottky contact resistance with the electrodes due to the naturally formed Van der Waals gap. The large Schottky contact resistance can make the field effect transistor act as bipolar behaviour with low mobility, which makes the 2-D material based FET cannot have fixed high mobility as originally anticipated. In this project, we apply the most common and industrial-favored doping/annealing method to improve the contact between MoS2 and gold.
MoS2 is considered as a rising star in 2-D family for its direct and applicable band gap. The feasibility of CVD growth and stability issue make MoS2 attractive to semiconductor researchers. The prospering research in MoS2 electronics also provides the possible applications such as opto-communication, spin-memory, and quantum computing. Nevertheless, gold is widely applied in contact and connecting metal for its high conductive and inert properties. However, based on theoretical calculations, large tunneling barrier and weak orbital overlap will be formed, which lead to high contact resistance and Schottky contact behavior in Au-MoS2 contact.
Project Team Members
List of Publications
- Black Phosphorus Field-Effect Transistors with Work Function Tunable Contacts Yuqiang Ma, Chenfei Shen, Anyi Zhang, Liang Chen, Yihang Liu, Jihan Chen, Qingzhou Liu, Zhen Li, Moh. R. Amer, Tom Nilges, Ahmad N. Abbas, and Chongwu Zhou ACS Nano 2017, 11, 7126-7133
- Yann-Wen Lan, Carlos M. Torres Jr., Shin-Hung Tsai, Xiaodan Zhu, Yumeng Shi, Ming-Yang Li, Lain-Jong Li, Wen-Kuan Yeh, Kang L. Wang, ‘Atomic-Monolayer MoS2 Band-to-Band Tunneling Field-Effect Transistor’, Small, published online August 2016.
- Yann-Wen Lan, Carlos M. Torres Jr., Xiaodan Zhu, Hussam Qasem, James R. Adleman, Mitchell B. Lerner, Shin-Hung Tsai, Yumeng Shi, Lain-Jong Li, Wen-Kuan Yeh, Kang L. Wang, ‘Dual-mode Operation of 2D Material-base Hot Electron Transistors’, Scientific Reports, 6 (2016), 32503.
- Carlos M. Torres Jr., Yann-Wen Lan, Caifu Zeng, Jyun-Hong Chen, Xufeng Kou, Aryan Navabi, Jianshi Tang, Mohammad Montazeri, James R. Adleman, Mitchell B. Lerner, Yuan-Liang Zhong, Lain-Jong Li, Chii-Dong Chen, and Kang L. Wang, “High-Current Gain Two-Dimensional MoS2-Base Hot-Electron Transistors”, Nano Letters, 2015, 15 (12), 7905–7912.
- Xiaodan Zhu, Toshiyuki Kawaharamura, Adam Z. Stieg, Chandan Biswas, Lu Li, Zhu Ma, Mark A. Zurbuchen, Qibing Pei, and Kang L. Wang, “Atmospheric and Aqueous Deposition of Polycrystalline Metal Oxides Using Mist-CVD for Highly Efficient Inverted Polymer Solar Cells”, Nano Letters, 2015, 15 (8), 4948-4954.
- Junjie Qi, Yann-Wen Lan, Adam Z. Stieg, Chen, Jyun-Hong Chen, Yuan-Liang Zhong, Lain-Jong Li, Chii-Dong Chen, Yue Zhang, Kang L. Wang, “Piezoelectric Effect in Chemical Vapour Deposition-Grown Atomic-Monolayer Triangular Molybdenum Disulfide Piezotronics”, Nature Communications, 6: 7430/1-8.
- Chandan Biswas, Zhu Ma, Xiaodan Zhu, Toshiyuki Kawaharamura, Kang L. Wang, “Inverted polymer solar cells based on thin ZnO films grown by Mist chemical vapor deposition system”, SPIE Optics+Photonics Proceedings, Aug 2014, 9184, 57.
- Ryan Hoekstra, Mei Xue, Xiaodan Zhu, Hussam Qasem Kang L. Wang, “Nanostructures for high efficiency organic solar cells”, 2012 INC8 Meeting, Tskuba, Japan, May, 2012.
- Zhu, J., Zhu, X., Hoekstra, R.M., Li L., Xiu, F.; Xue, M. Zeng, B., Wang, K.L. "Metallic Nanomesh Electrodes with Controllable Optical Properties for Organic Solar Cells" Applied Physics Letters, 2012, 100, 143109.
- Jinfeng Zhu, Mei Xue, Ryan Hoekstra, Baoqing Zeng and Kang L. Wang, “Light concetration and redistribution in polymer solar cells by plasmonic nanoparticles”, Nanoscale, 2012, 4, 1978-1981.
- Jinfeng Zhu, Mei Xue, Huajun Shen, Zhe Wu, Seongku Kim, Jyh-Jier Ho, Aram Hassani-Afshar, Baoqing Zeng and Kang L. Wang, “ Plasmonic light concentration in organic photovoltaic thin films induced by hexagonal periodic metallic nanospheres”, Applied Physics Letter, 2011, 98, 151110.
- Mei Xue, Lu Li, Bertrand J. Tremolet de Villers, Huajun Shen, Jinfeng Zhu, Zhibin Yu, Adam Z. Stieg, Qibing Pei, Benjamin J. Schwartz, and Kang L. Wang, “Charge-carrier Dynamics in Hybrid Plasmonic Organic Solar Cells with Ag Nanoparticles”, Applied Physics Letter, 2011, 98, 253302.
- Mei Xue, Huajun Shen, Jack J. Ho, Jinfeng Zhu, Seongku Kim, and K. L. Wang, “Absorption and transport enhancement by metal nanoparticle plasmonics for organic optoelectronics”, 2010 EMRS Spring Meeting, Strasburg, France, June, 2010.
- Mei Xue, Jinfeng Zhu, Huajun Shen, Seongku Kim, Jack J. Ho, Hussam Aldeen S. Qasem, Zaid S. Al Otaibi and K. L. Wang, “Charge transport and absorption study of metal nanoparticle plasmonics for organic photovoltaics”, 2011 APS Spring Meeting, Dallas, March, 2011.
- Hussam Qasem, Abdullah A. Alzaben, Hani Enaya, Zaid S. Al Otaibi, Mei Xue, Huajun Shen, Jinfeng Zhu, Seongku Kim, Lu Li, Zhibin Yu, Qibing Pei and Kang L. Wang, , “Absorption and transport enhancement by Ag nanoparticle plasmonics for organic optoelectronics“,2011 SIECPC11 Meeting, Saudi Arabia, April, 2011.
- Mei Xue, Lu Li, Bertrand Tremolet de Villers, Huajun Shen, Jinfeng Zhu, Zhibin Yu, Adam Z. Stieg, Qibing Pei, Benjamin J. Schwartz, and Kang L. Wang, “Charge transport and absorption study of metal nanoparticle plasmonics for organic photovoltaics”, 2011 INC7 Meeting, Albany, June, 2011.