Archival Journal Articles

1.      Z. Y. Zhao, C. Yi, A. D. Stiff-Roberts, A. J. Hoffman, D. Wasserman, and C. Gmachl, “Probing Dopant Incorporation in InAs/GaAs QDIPs by Polarization-Dependent Fourier Transform Infrared Spectroscopy,” Infrared Physics & Technology, in press (2007).

2.      K. R. Lantz and A. D. Stiff-Roberts, “Fourier transform infrared absorbance and photoluminescence spectroscopy studies of CdSe colloidal quantum dot/conducting polymer nanocomposites for application to infrared photodetectors,” in Hybrid Functional Materials for Optical Applications, Edited by A. Cartwright, T. M. Cooper, A. Koehler, and K. S. Schanze (Materials Research Society Symposium Proceedings, vol. 1015E, Warrendale, PA, 2007), paper 1015-BB06-12.

3.      A. D. Stiff-Roberts, W. Zhang, J. Xu, H. Peng, and H. O. Everitt, “Spin-cast Deposition of CdSe-CdS Core-shell Colloidal Quantum Dots on Doped GaAs Substrates: Structural and Optical Characterization,” IEEE Transactions on Nanotechnology, vol. 6, pp. 413-420, July 2007.

4.      Z. Zhao, C. Yi, K. R. Lantz, and A. D. Stiff-Roberts, “Effect of donor-complex-defect-induced dipole field on InAs/GaAs quantum dot infrared photodetector activation energy,” Applied Physics Letters, vol. 90, pp. 233511-1-3, June 2007. Also appeared at Virtual Journal of Nanoscale Science & Technology, vol. 15 (24), June 2007.

5.      Z. Zhao, C. Yi, A. D. Stiff-Roberts, A. J. Hoffman, D. Wasserman, and C. Gmachl, “DX-like Centers in InAs/GaAs QDIPs Observed by Polarization-Dependent Fourier Transform Infrared Spectroscopy,” Journal of Vacuum Science and Technology B, vol. 25, pp. 1108-1112, May/Jun 2007.

6.  A. D. Stiff-Roberts, "Hybrid Nanomaterials for Multi-spectral Infrared Photodetection," International Journal of High Speed Electronics and Systems, vol. 17, pp. 165-172, March 2007.

7.     E. B. Stokes, A. D. Stiff-Roberts, and C. T. Dameron, “Quantum dots in semiconductor optoelectronic devices,” The Electrochemical Society Interface, Winter, pp. 23-27, 2006.

8.      A. D. Stiff-Roberts, A. Gupta, and Z. Zhao, “Optical Characterization of CdSe Colloidal Quantum Dot/ MEH-PPV Polymer Nanocomposites Spin-cast on GaAs Substrates,” in Hybrid Organic/Inorganic/Metallic Electronic and Optical Devices, Edited by D. Selmarten, (Materials Research Society Symposium Proceedings, vol. 939E, Warrendale, PA, 2006), paper 0939-002-04.

9.      S. Chakrabarti, A. D. Stiff-Roberts, X. H. Su, P. Bhattacharya, G. Ariyawansa and A. G. U. Perera, "High-performance mid-infrared quantum dot infrared photodetectors," Journal of Physics D: Applied Physics, vol. 38, pp. 2135-2141, June 2005.

10.   A. D. Stiff-Roberts, S. Chakrabarti, X. Su, and P. Bhattacharya, “Research propels quantum dots forward,” Laser Focus World, vol. 41, pp. 103-108, May 2005.

11.  X. H. Su, S. Chakrabarti, A. D. Stiff-Roberts, J. Singh, and P. Bhattacharya, “Quantum dot infrared photodetector design based on double-barrier resonant tunneling,” Electronics Letters, vol. 40, pp. 1082-1083, August 2004.

12.  S. Chakrabarti, A. D. Stiff-Roberts, P. Bhattacharya, and S. W. Kennerly, “Heterostructures for achieving large responsivity in InAs/GaAs quantum dot infrared photodetectors,” Journal of Vacuum Science and Technology B, vol. 22, pp. 1499-1502, May/Jun 2004.

13.  S. Chakrabarti, A. D. Stiff-Roberts, P. Bhattacharya, S. Gunapala, S. Bandara, S. B. Rafol, and S. W. Kennerly, “High-temperature operation of InAs/GaAs quantum dot infrared photodetectors with large responsivity and detectivity,” IEEE Photonics Technology Letters, vol. 16, pp. 1361-1363, May 2004.

14.  A. D. Stiff-Roberts, X. H. Su, S. Chakrabarti, and P. Bhattacharya, “Contribution of field-assisted tunneling emission to dark current in InAs/GaAs quantum dot infrared photodetectors,” IEEE Photonics Technology Letters, vol. 16, pp. 867-869, March 2004.

15.  S. Chakrabarti, A. D. Stiff-Roberts, P. Bhattacharya, and S. W. Kennerly, “High responsivity AlAs/InAs/GaAs superlattice quantum dot infrared photodetector,” Electronics Letters, vol. 40, pp. 197-198, February 2004.

16.  S. Chakrabarti, P. Bhattacharya, A. D. Stiff-Roberts, Y. Y. Lin, J. Singh, Y. Lei, and N. Browning, “Intersubband absorption in annealed InAs/GaAs quantum dots: a case for polarization-sensitive infrared detection,” Journal of Physics D: Applied Physics, vol. 36, pp. 1794-1797, July 2003.

17.  B. Kochman, A. D. Stiff-Roberts, S. Chakrabarti, J. D. Phillips, S. Krishna, J. Singh, and P. Bhattacharya, “Absorption, carrier lifetime, and gain in InAs/GaAs quantum dot infrared photodetectors,” IEEE Journal of Quantum Electronics, vol. 39, pp. 459-467, March 2003.

18.  P. Bhattacharya, A. D. Stiff-Roberts, S. Krishna, and S. Kennerly, “Quantum dot infrared detectors and sources,” International Journal of High Speed Electronics and Systems, vol. 12, pp. 969-994, 2002.

19.  S. Krishna, A. D. Stiff-Roberts, J. D. Phillips, P. Bhattacharya, and S. W. Kennerly, “Hot dot detectors: Infrared quantum dot intersubband photodetectors are a promising technology for multiwavelength IR detection,” IEEE Circuits &Devices Magazine, vol. 18, pp. 14-24, 2002.

20.  A. D. Stiff-Roberts, S. Chakrabarti, S. Pradhan, B. Kochman, and P. Bhattacharya, “Raster-scan imaging with normal-incidence, mid-infrared InAs/GaAs quantum dot infrared photodetectors,” Applied Physics Letters, vol. 80, pp. 3265-3267, May 2002.

21.  A. D. Stiff-Roberts, S. Krishna, P. Bhattacharya, and S. Kennerly, “Low-bias, high-temperature performance of a normal-incidence InAs/GaAs vertical quantum-dot infrared photodetector with a current-blocking barrier,” Journal of Vacuum Science & Technology B, vol. 20, pp. 1185-1187, May 2002.

22.  A. D. Stiff, S. Krishna, P. Bhattacharya, and S. W. Kennerly, “Normal-incidence, high-temperature, mid-infrared, InAs-GaAs vertical quantum-dot infrared photodetector,” IEEE Journal of Quantum Electronics, vol.37, pp.1412-1419, Nov. 2001.

23.  A. D. Stiff, S. Krishna, P. Bhattacharya, and S. Kennerly, “High-detectivity, normal-incidence, mid-infrared (lambda ~4 mm) InAs/GaAs quantum-dot detector operating at 150 K,” Applied Physics Letters, vol.79, pp.421-423, July 2001.

 Book Contributions

24.  P. Bhattacharya, X. Su, S. Chakrabarti, A. D. Stiff-Roberts, and C. H. Fischer, "Intersubband transitions in quantum dots", in Intersubband Transitions in Quantum Structures, pp. 315-345, Edited by R. Paiella, McGraw-Hill, New York (2006).

25.  J. Phillips, A. Stiff-Roberts, and P. Bhattacharya, "Quantum dot infrared detectors", in Handbook of Semiconductor Nanostructures and Nanodevices, vol.4,  pp.195-218, Edited by A.A. Balandin and K.L. Wang, American Scientific Publishers, Los Angeles (2006).

26.  P. Bhattacharya, S. Ghosh, and A. D. Stiff-Roberts, “Quantum dot opto-electronic devices,” in Annual Review of Materials Research, vol. 34, pp. 1-40, Edited by D. R. Clarke and M. Rühle, Annual Reviews, Palo Alto (2004).

27.  J. Phillips, A. D. Stiff-Roberts, and P. Bhattacharya, “Quantum dot infrared photodetector,” in Encyclopedia of Nanoscience and Nanotechnology, vol. 9, pp. 131-141, Edited by H. S. Nalwa, American Scientific Publishers, Los Angeles (2004).

 Invited Conference Proceedings

28.     W. D. Zhou, H. Yang, L. Chen, Z. Qiang, A. D. Stiff-Roberts, G. J. Brown, “Photonic crystals for spectrally selective infrared photonics,” (INVITED) The 6th Asia-Pacific Conference on Near-Field Optics, Yellow Mountain, China, June 2007.

29. A. D. Stiff-Roberts, "Hybrid Nanomaterials for Multi-spectral Infrared Photodetection," (INVITED) 1st Annual Integrated Nanostructured Systems Workshop: Multi-functional Nanomaterials and Nanodeviecs, Buffalo, NY, May 2007.

30.  A. D. Stiff-Roberts, “Hybrid Nanomaterials for Multi-spectral Infrared Photodetection,” (INVITED) Lester Eastman Conference on High Performance Devices, Ithaca, NY, August 2006.

31.  A. D. Stiff-Roberts, “Challenges to High-Performance Quantum Dot Infrared Photodetectors,” (INVITED) Symposium on Infrared Materials and Technologies, State College, PA, October 2004.

 Conference Proceedings

32. R. Pate, K. Lantz, and A. D. Stiff-Roberts, "Matrix-Assisted Pulsed Laser Evaporation of Hybrid Colloidal Quantum Dot/Conducting Polymer Nanocomposite Heterostructures," Electronic Materials Conference, Notre Dame, IN, June 2007. 

33. Z. Zhao, K. R. Lantz, C. Yi, and A. D. Stiff-Roberts, “Doping Effect on Carrier Occupation and Transport in InAs/GaAs Quantum Dot Infrared Photodetectors: A Capacitance-Voltage Spectroscopy Study,” Conference on Lasers and Electro-Optics, Baltimore, MD, May 2007 (poster).

34.  K. Lantz and A. D. Stiff-Roberts, “Fourier transform infrared absorbance and photoluminescence spectroscopy studies of conducting polymer/CdSe colloidal quantum dot nanocomposites for application to infrared photodetectors,” Materials Research Society Spring Meeting, San Francisco, CA, April 2007.

35.  Z. Zhao, C. Yi, A. D. Stiff-Roberts, A. J. Hoffman, D. Wasserman, and C. Gmachl, “DX Centers in InAs/GaAs QDIPs Observed by Polarization-Dependent Fourier Transform Infrared Spectroscopy,” North American Conference on Molecular Beam Epitaxy, Durham, NC, October 2006 (poster).

36.  U. Uzoka and A. D. Stiff-Roberts, “Effect of GaAs Substrate Doping Concentration on Photoluminescence Spectra of CdSe Colloidal Quantum Dot/MEH-PPV Polymer Nanocomposites,” SPIE Optics in the Southeast 2006, Charlotte, NC, September 2006.

37.  A. D. Stiff-Roberts, Z. Zhao, and C. Yi, “Control of Dopant Incorporation in InAs/GaAs Quantum Dots for Infrared Photodetection with Low Dark Current,” Conference on Lasers and Electro-Optics, Long Beach, CA, May 2006.

38.  A. D. Stiff-Roberts, A. Gupta, and Z. Zhao, “Optical characterization of CdSe colloidal quantum dot/ MEH-PPV polymer nanocomposites spin-cast on GaAs substrates,” Materials Research Society Spring Meeting, San Francisco, CA, April 2006.

39.  A. D. Stiff-Roberts, W. Zhang, H. Peng, H. Everitt, and J. Xu, “Structural and Optical Characterization of CdSe/CdS Colloidal Quantum Dots Spin-Cast on GaAs Substrates for Application to Infrared Photodetectors,” Electronic Materials Conference, Santa Barbara, CA, June 2005.

40.  Z.-K. Wu, H. Choi, T. B. Norris, A. Stiff-Roberts, and P. Bhattacharya, “Ultrafast electronic dynamics in unipolar n-doped InAs/GaAs quantum dot structures,” Quantum Electronics and Laser Science Conference, Baltimore, MD, May 2005.

41.  X. H. Su, A. D. Stiff-Roberts, S. Chakrabarti, J. Singh, and P. Bhattacharya, “Resonant Tunneling Quantum Dot Infrared Photodetector (RT-QDIP): Separating Dark Current and Photocurrent,” Device Research Conference, Notre Dame, IN, June 2004 (poster).

42.  A. D. Stiff-Roberts, S. Chakrabarti, P. Bhattacharya, and S. Kennerly, “Tailoring of Quantum Dot Infrared Photodetector Performance with AlAs/GaAs Superlattice Barriers,” Lasers and Electro-Optics Society Meeting, Tucson, AZ, October 2003.

43.  S. Chakrabarti, A. D. Stiff-Roberts, P. Bhattacharya, and S. Kennerly, “Heterostructures for Achieving Very Large Responsivity in InAs/GaAs Quantum Dot Infrared Photodetectors,” North American Conference on Molecular Beam Epitaxy, Keystone, CO, September 2003.

44.  A. D. Stiff-Roberts, S. Chakrabarti, S. Kennerly, and P. Bhattacharya, “High-responsivity, Polarization-sensitive, 70-layer InAs/GaAs Quantum Dot Infrared Photodetector,” Conference on Lasers and Electro-Optics, Baltimore, MD, June 2003.

45.  A. Stiff-Roberts, S. Krishna, P. Bhattacharya, and S. Kennerly, “Low-bias, High-temperature Performance of a Normal-incidence InAs/GaAs Vertical Quantum Dot Infrared Photodetector with a Current-blocking Barrier,” North American Conference on Molecular Beam Epitaxy, Providence, RI, October 2001.

46.  A. Stiff, S. Krishna, P. Bhattacharya, and S. Kennerly, “High-temperature Operation of Mid-infrared (l = 4-5 mm) Vertical and Lateral InAs/GaAs/AlGaAs Quantum Dot Infrared Photodetectors,” Device Research Conference, Notre Dame, IN, June 2001.

 Invited Talks

47.  A. D. Stiff-Roberts, “Hybrid Nanomaterials for Infrared Photodetection,” Princeton Institute for the Science and Technology of Materials (PRISM) Spring 2006 Seminar Series, Princeton, NJ, March 2006.

48.  A. D. Stiff-Roberts, “Design, Fabrication, and Characterization of InAs/GaAs Quantum Dot Infrared Photodetectors for High-Temperature Operation,” David and Lucile Packard Foundation Graduate Scholars Annual Meeting, Washington, D.C., July 2004.

49.  A. Stiff-Roberts, P. Bhattacharya, S. Chakrabarti, and S. Kennerly, “Infrared Imaging with InAs/GaAs Quantum Dot Infrared Photodetector Focal Plane Arrays,” Society of Minority Engineering Students – Graduate Component Research Symposium, Ann Arbor, MI, October 2003.

50.  P. Bhattacharya and A. D. Stiff-Roberts, “Development of InAs/GaAs QDIPs for Focal Plane Arrays,” Jet Propulsion Laboratory Infrared Focal Planes and Photonics Technology Group Seminar, Pasadena, CA, February 2003.

51.  A. D. Stiff-Roberts, S. Chakrabarti, S. Kennerly, and P. Bhattacharya, “Infrared Imaging with InAs/GaAs Quantum Dot Infrared Photodetector Focal Plane Arrays,” Wayne State University Electrical and Computer Engineering Department Seminar, Detroit, MI, November 2002.

52.  A. D. Stiff-Roberts, S. Chakrabarti, S. Kennerly, and P. Bhattacharya, “Infrared Imaging with InAs/GaAs Quantum Dot Infrared Photodetector Focal Plane Arrays,” Spelman College Physics Department Seminar, Atlanta, GA, October 2002. 

53.  A. Stiff-Roberts, S. Krishna, P. Bhattacharya, and S. Kennerly, “Quantum Dot Infrared Photodetectors,” Society of Minority Engineering Students – Graduate Component Research Symposium, Ann Arbor, MI, November 2001.