Alan Heeger

Professor Emeritus

Contact Phone

805.893.3184

Office Location

Broida 4415

Specialization

Condensed Matter Experimental Physics

Research

Current research: aspects of the science and technology of semiconducting and metallic polymers with focus on high mobility field effect transistors and low cost “plastic” solar cells. Current interests also include biosensors for the detection of specific targeted sequences on DNA, the detection of specific proteins and the detection of biologically relevant small molecules.

Publications

1.      Electrical Conductivity of Doped Polyacetylene, C.K. Chiang, C.K. Fincher, Y.W. Park, A.J. Heeger, H. Shirakawa, E.J. Louis, and A.G. MacDiarmid, Phys. Rev.Lett. 39, 3830 (1977)

2.      Optical Properties of Linear Chain Mercury Compounds, D.L. Peebles, C.K. Chiang, M.J. Cohen, A.J.Heeger, N.D.Miro and A.G.Macdiarmid, Phys. Rev B 15, 4607 (1977)

3.      X-ray scattering study of the One-Dimensional Lattice Dynamics in Hg3-d, R. Spal, C.E. Chen, T. Egami,  P.J. Nigrey, and A.J. Heeger, Phys. Rev B 21, 3110 (1980)

4.      Soliton Excitations in Polyacetylene, W.P. Su, J.R. Schrieffer, and A.J. Heeger, Phys. Rev B 22, 2099 (1980)

5.      Solitons in Conducting Polymers, A.J.Heeger, S.Kivelson, J.R. Schrieffer, and Wu-Pei Su, Reviews of Modern Physics 60, (July 1988)

6.      Visible Light Emission from Semiconducting Polymer Diodes, D. Braun, A. J. Heeger Appl. Phys. Lett. 58 (18) 1982 (1991)

7.      Flexible Light-Emitting Diodes Made From Soluble Conducting Polymers, G.Gustassson, Y. Cao, G.M. Treacy, f.Klavetter, N.Colaneri, and A.J.Heeger, Nature, 357, 72 20 564 (1992)

8.      Polymer Light Emitting Electrochemical Cells, Q. Pei, G. Yu, C. Zhang, Y. Yang, and A.J. Heeger, Science, 269, 1086 (1995)

9.      Semiconducting Polymers: A new Class of Solid State Laser Materials, F. Hide, M.A. Diaz-Garcia, B.J. Schwartz, M.R. Andersson, Q. Pei and A.J. Heeger, Science, 273, 1833 (1996)

10.  Semiconducting Polymer Distributed Feedback Laser, M.D. McGehee, M.A. Diaz-Garcia, F. Hide, E.K. Miller, B.J. Schwartz, D. Moses and A.J. Heeger, Appl. Phys. Lett., 72, 136((1998)

11.  Large Area, Full Color, Image Sensors Made from Semiconducting Polymers, G. Yu, J. Wang, J. McElvain and A.J. Heeger Adv. Mater. 10, 3115 (1998)

12.  Semiconducting and Metallic Polymers: The Fourth Generation of Polymeric Materials, A.J. Heeger, Rev. Mod. Phys. 73, 681-718 (2001)

13.  Light Emission from an Ambipolar Semiconducting Polymer Field Effect Transistor, Analysis of the Device Physics, J. S. Swensen, J. Yuen, D. Gargas, S. K. Buratto, A. J. Heeger, J. Appl. Phys. 102, 013103 (2007)

14.  High Detectivity Polymer Photodetectors with Spectral Response from 300 nm to 1450nm, X. Gong, M. Tong, Y. Xia, W. Cai, J.S. Moon, Y. Cao, G.Yu, C.-L. Shieh, B. Nilsson, and A.J. Heeger, Science 325, 5948, 1665-1667 (2009)

15.  Nonlinear Transport in Semiconducting Polymers at High Current Densities, J.D. Yuen, R. Menon, N.E. Coates, E.B. Namdas, S. Cho, S.T. Hannahs, D. Moses, A.J. Heeger, Nature Materials, 8, 572 (2009)

16.  Semiconducting Polymers: The Third Generation, A.J. Heeger Chem. Soc. Rev., 39, 2354 (2010)

17.  Polymer Photovoltaic Cells:  Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions, G. Yu, J. Gao, J.C. Hummelen, F. Wudl, Science 270 1789 (1995)

18.  Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene,  N.S. Sariciftci, L. Smilowitz and F. Wudl, Science 258 1474 (1992)

19.  Ultrafast Spectroscopic Studies of Photoinduced Electron Transfer from Semiconducting Polymers to C60,  B. Kraabel, D. McBranch, N.S. Sariciftci and D. Moses, Phys. Rev. B 50 (24) 18543 (1994)

20.  Ultrafast Photogeneration of charged polarons in Conjugated Polymers, P. B. Miranda, D. Moses and A. J. Heeger, Phys. Rev. B 64 (8), 081201 (2001)

21.  Efficiency Enhancement in Low Band-Gap Solar Cells by Processing with Alkane Diols, J. Peet, J.Y. Kim, N.E. Coates, W.L. Ma, D. Moses, A.J. Heeger  and G.C. Bazan, Nature Materials, 6, 497, (2007)

22.  Processing Additives for Improved Efficiency from Bulk Heterojunction Solar Cells, J.K. Lee, W.L. Ma, C. Brabec, J. Yuen, J.S. Moon, J.Y. Kim, K. Lee, G.C. Bazan and A. J. Heeger, J. Amer. Chem. Soc. 130, 3619 (2008)

23.  Recombination in polymer-fullerene bulk heterojunction solar cells, S.R. Cowan, A. Roy, A. J. Heeger, Phys.Rev B 82245207 (2010)

24.  "Column-like" Structure of the Cross-Sectional Morphology of Bulk Heterojunction Materials, J. S. Moon, J. K. Lee, S. Cho, J. Byun, A. J. Heeger Nano. Lett., 9, 1, 230-234 (2009) (subsequently confirmed by TEM Tomography)

25.  Spontaneous Formation of Bulk Heterojunction Nanostructures: Multiple Routes to Equivalent Morphologies, J.S. Moon, C.J. Takacs, Y. Sun, A.J. Heeger, Nano. Lett., 11 036 (2011)

26.  Bulk Heterojunction Solar Cells with Internal Quantum Efficiency Approaching 100%, S.H. Park, A. Roy, S. Beaupre, S. Cho, N. Coates, J.S. Moon, D. Moses, M. Leclerc, K. Lee and A.J. Heeger, Nature Photonics, 3,297 (2009)

27.  Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing, J.Y. Kim, K. Lee, N.E. Coates, D. Moses, T.Q. Quyen, M. Dante, A.J. Heeger, Science,317, 222 (2007)

28.  Charge Formation, Recombination and Sweep–out Dynamics in Organic Solar Cells, S.R. Cowan, N. Banerji, W.L. Leong A.J. Heeger Adv. Funct. Mater. 22:6 1116 (2012)

29.  Identifying a Threshold Impurity Level for Organic Solar Cells: Enhanced First Order Recombination via Well-defined PC84Trapsin Organic Bulk Heterojunction Solar Cells, S.R. Cowan, W.L. Leong, N. Banerji, G. Dennler, A.J. Heeger, Adv. Funct. Mater., 21, 3083 (2011)

30.  Solution Processed Small-Molecule Solar Cells with 6.7% Efficiency, Y. Sun, G.C. Welch, W.L. Leong, C.J. Takacs, G.C. Bazan, A.J. Heeger, Nature Materials, 11, 44 (2012)                                                         

31.  Photoinduced Charge Generation in a Molecular Bulk Heterojunction Material, L.G. Kaake, J.J. Jasieniak, R.C. Bakus, G.C. Welch, D. Moses, G.C. Bazan, Heeger, J. Amer. Chem. Soc. 134, 19828-19838 (2012)

32.  Influence of Processing Additives on Charge-Transfer Time Scales and Sound Velocity in Organic Bulk Heterojunction Films, L.G. Kaake, G.C. Welch, D. Moses, G.C.  Bazan, A.J. Heeger,  J. Phys. Chem. Lett., 3, 1253-1257(2012)

33.  Coherence and Uncertainty in Nanostructured Materials,L.G. Kaake, D. Moses, A. J. Heeger, J. Phys. Chem. Lett.4, 2264−2268 (2013)