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Peter HO Kian Hoon

Associate Professor

Office : S7-03-10
Tel : (65) 6516 8781
Fax : (65) 6777 6126
Email : phyhop@nus.edu.sg
     
 
Curriculum Vitae of Dr Peter Ho

Education: Undergraduate, National University of Singapore; B.Sc.(Hons) Class 1 in Materials Science (1992-6); Ph.D. (1996-9; University of Cambridge; thesis advisor, Richard Friend)

Employment: Associate Professor, Dept. of Physics, National University of Singapore (2010–present); Assistant Professor, Dept. of Physics, National University of Singapore (2004–2010); Postdoctoral Fellow, Univ. of Cambridge, U.K. (2003); Research Fellow, St. John's College, Cambridge, U.K. (2000–2003); Visiting Scientist, Bell Laboratories, New Jersey, U.S.A. (2001–2002, concurrent with above); Scientist (Consultant), Cambridge Display Technology Ltd, U.K. (1998–2001; 2009–present).

Prizes, Membership of Advisory Boards etc: Barton Prize in Applied Physics, Univ. of Cambridge, U.K (2000); Omicron Nanotechnology Physics Prize, Institute of Physics, Singapore (2005); Young Scientist Award, Singapore National Academy of Sciences, Singapore (2005); Member of the Advisory Board, Chemical Society Reviews (impact factor 20); Top Outstanding Young Person in Singapore (Academic Leadership) (Junior Chamber of Commerce, 2009); Grant reviewer, National Science Foundation, U.S.A.; European Science Foundation, E.U.; SERC, U.K.

Invited/ Keynote Lectures at International Meets: Materials Research Society 2000 Spring Meeting (San Francisco, U.S.A.); American Chemical Society 222nd National Meeting 2001 (Chicago, U.S.A.); SPIE International Symposium on Photonics Applications, 2001 (Singapore); Materials Research Society 2003 Fall Meeting (Boston, U.S.A.); Keynote: International Conference on Synthetic Metals, 2004 (Wollongong, Australia); Keynote: International Society of Electrochemistry 2006 Spring Meeting (Singapore); European Materials Research Society 2008 Spring Meeting (Strasburg, France); Electronic Structure and Processes at Molecular-based Interfaces 2008 Meeting (Princeton, U.S.A.); Plastic Electronics Europe 2009 Meeting (Dresden, Germany); SPIE Optics+Photonics 2010 Meeting (San Diego, U.S.A.)

Professional Contributions: Co-chair and organiser, Symposium R “Polymer and Molecular Electronics”, International Conference on Materials for Advanced Technologies 2-6 Jul 2007 (Singapore); Co-chair and organiser, Symposium N “Plastic Electronics”, International Conference on Materials for Advanced Technologies 28Jun-3Jul 2009 (Singapore); Founding PI, Organic Nano Device Laboratory, National University of Singapore, 2004.

Citations (original research articles): 3100+ (h-index = 24; Number of publications = 70+)

Patents Filed/ Granted: 18+

Research Interest: Peter Ho led together with Dr Chua Lay-Lay the team that set up in NUS 2004 the Organic Nano Device Laboratory (ONDL), the first comprehensive plastic electronics research lab in Singapore, to lead both fundamental and applied research into the physics, chemistry and processing of plastic semiconductors and their devices. This is now a 250 sq m Class 1000 cleanroom facility (with Class 100 workspaces) supported by 150 sq m chemistry and facilities space, and 120 sq m staff and students office space, with a steady stream of innovations in plastic electronics that are reported by the international media. We are primarily an experimental research group, although we also do quantum chemical calculations and device modeling to interpret our results. We aim to develop the required scientific understanding and nanotechnology breakthroughs to make plastic electronic devices more efficient and higher performing. These include light-emitting diodes, transistors, and solar cells, and graphene devices. We work extensively with in international and industrial collaborations. Current research projects and highlights can be found at: www.physics.nus.edu.sg/~ondl/ . Intellectual properties generated from our work are being licensed to companies. Work from this laboratory is regularly featured by the international media and the local media (see for example, the Singapore Nanotechnology Capabilities Report 2010).

Current Research and Future Direction

Organic semiconductor device physics and technology, covering polymer light-emitting diodes, field-effect transistors, photovoltaic memory devices, and monolayer devices. Polymer heterostructures and interfaces.

The following programmes have been initiated:

  • Interface science : We have initiated a programme to study the frontier polymer chains at both the air and substrate interfaces of polymer semiconductors using near-edge X-ray absorption spectroscopy at the Singapore Synchrotron Light Source and their relevance to device performance, in collaboration with the surface science group of Professor Andrew Wee of the Department of Physics.

  • Device physics : We have initiated a programme to study charge-modulated absorption in devices and its application to measure built-in potential and energy level alignment in state-of-the-art devices, in collaboration with groups at the Institute of Materials Research and Engineering (IMRE).

  • Novel device architectures: We have initiated various programmes to fabricate novel architectures of polymer FETs and memory devices. Recent successes in Singapore include the discovery of general n-type field-effect behaviour in organic semiconductors, the discovery of logic gates from four-terminal dual-gate devices, the observation of robust insulator-to-metal transformation in polymer-nanocrystal composites and the achievement of robust ultrathin gate dielectrics. A number of these investigations are conducted in collaboration with the group of Professor Richard Friend of University of Cambridge.

     
   
Selected Publications

  • Giant broadband nonlinear optical absorption response in dispersed graphene single sheets. G.K. Lim, Z.L. Chen, J. Clark, R.G.S. Goh, W.H. Ng, H.W. Tan, R.H. Friend, P.K.H. Ho, L.L. Chua, Nature Photonics, 5, 554-560 (2011).

  • High-performance polymer semiconducting heterostructure devices by nitrene-mediated photocrosslinking of alkyl side chains. R.Q. Png, P.J. Chia, J.C. Tang, B. Liu, S. Sivaramakrishnan, M. Zhou, S.H. Khong, H.S.O. Chan, J.H. Burroughes, L.L. Chua, R.H. Friend, P.K.H. HoL.L. Chua, Nature Mater. 9, 152-158 (2010).

  • Role of delta-hole-doped interfaces at Ohmic contacts to organic semiconductors. M. Zhou, L.L. Chua, R.Q. Png, C.K. Yong, S. Sivaramakrishnan, P.J. Chia, A.T.S. Wee, R.H. Friend, P.K.H. Ho, Phys. Rev. Lett. 103, 036601-1-4 (2009).

  • Direct evidence for the role of the Madelung potential in detemining the work function of doped organic semiconductors. P.J. Chia, S. Sivaramakrishnan, M. Zhou, R.Q. Png, L.L. Chua, R.H. Friend, P.K.H. Ho, Phys. Rev. Lett. 102, 096602-1-4 (2009).

  • Direct evidence for delocalisation of charge carriers at the Fermi level in a doped conducting polymer. J.M. Zhuo, L.H. Zhao, P.J. Chia, W.S. Sim, R.H. Friend, P.K.H.Ho, Phys. Rev. Lett. 100, 186601-1-4 (2008).

  • Controlled insulator-to-metal transformation in printable polymer composites with nanometal clusters. S. Sivaramakrishnan, P.J. Chia, Y.C. Yeo, L.L. Chua and P.K.H. Ho,Nature Mater. 6, 149-155 (2007). .

  • General observation of n-type field-effect behaviour in organic semiconductors. L.L. Chua, J. Zaumseil, J.F. Chang, E.C.W. Ou, P.K.H. Ho, Nature 434, 194-199 (2005).

  • Molecular-scale interface engineering for polymer light-emitting diodes. P.K.H. Ho, J.S. Kim, J.H. Burroughes, H. Becker, S.F.Y. Li, T.M. Brown, F. Cacialli, R.H. Friend, Nature 404 (2000) 481.

  • All-polymer optoelectronic devices. P.K.H. Ho, D.S. Thomas, R.H. Friend and N. Tessler, Science 285, 233-236 (1999).

Invited Book Chapter:

  • Printable metal nanoparticle inks for thin-film metallization: physicochemical aspects, in Handbook of Nanophysics. Ed: Klaus D. Sattler, Taylor & Francis (CRC Press), 2010

 

 

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