| AVS 61st International Symposium & Exhibition | |
| Energy Frontiers Focus Topic | Monday Sessions |
| Session EN+EM+MN+NS+TR-MoA |
| Session: | Energy Harvesting with Nanostructures |
| Presenter: | Weina Peng, University of Texas at Dallas |
| Authors: | W. Peng, University of Texas at Dallas S. Sampat, University of Texas at Dallas S. Rupich, University of Texas at Dallas B. Anand, University of Texas at Dallas H. Nguyen, University of Texas at Dallas D. Taylor, University of Texas at Dallas Y. Gartstein, University of Texas at Dallas Y.J. Chabal, University of Texas at Dallas A. Malko, University of Texas at Dallas |
| Correspondent: | Click to Email |
We report the observation of wavelength dependent photocurrent in thin silicon nanomembranes (75 nm) coupled to colloidal CdSe/ZnS nanocrystal quantum dots (NQDs). The measurement was performed on back-gated, FET-type thin Si structures, which are functionalized with self-assembled monolayer (SAM) of ester termination groups to prevent surface oxidation and the formation of surface defect states. A thin film of nanocrystals is drop casted on the surface and an increase of photocurrent, up to several hundred nA, are recorded as a function of excitation wavelength on NQD/SAM/Si devices vs. plain SAM/Si structures. Quantitative analysis of photocurrent vs. NQD absorption spectrum allows us to ascribe the observed photocurrents to the photoexcited NQD excitons transferred to the underlying Si substrate via non-radiative and radiative energy-transfer mechanisms 1 .
1H. M. Nguyen, O. Seitz, W. N. Peng, Y. N. Gartstein, Y. J. Chabal, and A. V. Malko, ACS Nano 6, 5574 (2012).