Skip to main content Accessibility help

Charge Generation and Transport in CdSe Semiconductor Quantum Dot Solids

  • C. A. Leatherdale (a1), N.Y. Morgan (a2), C. R. Kagan (a1), S. A. Empedocles (a1), M. G. Bawendi (a1) and M. A. Kastner (a2)...


We demonstrate photoconductivity and conductivity in three-dimensional close-packed solids of colloidal CdSe quantum dots. We observe quantum dot size and surface passivation dependent photoconductivity that can be qualitatively understood by considering the energy required in order to overcome the Coulomb energy of the initial electron-hole pair. Our results suggest that surface ligands that promote initial separation of the electron and hole reduce the electric field required for the onset of the photocurrent. The dark conductance is much smaller than the photoconductance. Hysteretic behaviour and extremely long-lived current transients are observed in the dark current that are suggestive of Coulomb-glass behaviour.



Hide All
1. Murray, C.B., Kagan, C.R., and Bawendi, M.G., Science 270 (5240), 13351338 (1995).10.1126/science.270.5240.1335
2. Korgel, B.A. and Fitzmaurice, D., Phys. Rev. Lett. 80 (16), 35313534 (1998).10.1103/PhysRevLett.80.3531
3. Collier, C.P., Saykally, R.J., Shiang, J.J., Henrichs, S.E., and Heath, J.R., Science 277 (5334), 19781981 (1997).10.1126/science.277.5334.1978
4. Terrill, R.H., Postlethwaite, T.A., Chen, C.H., Poon, C.D., Terzis, A., Chen, A.D., Hutchison, J.E., Clark, M.R., Wignall, G., Londono, J.D., Superfine, R., Falvo, M., Johnson, C.S., Samulski, E.T., and Murray, R.W., J. Amer. Chem. Soc. 117 (50), 1253712548 (1995).10.1021/ja00155a017
5. Andres, R.P., Bielefeld, J.D., Henderson, J.I., Janes, D.B., Kolagunta, V.R., Kubiak, C.P., Mahoney, W.J., and Osifchin, R.G., Science 273 (5282), 16901693 (1996).10.1126/science.273.5282.1690
6. Middleton, A.A. and Wingreen, N.S., Phys. Rev. Lett. 71 (19), 31983201 (1993).10.1103/PhysRevLett.71.3198
7. Whan, C.B., White, J., and Orlando, T.P., Appl. Phys. Lett. 68 (21), 29962998 (1996).10.1063/1.116675
8. Murray, C.B., Norris, D.J., and Bawendi, M.G., J. Amer. Chem. Soc. 115 (19), 87068715 (1993).10.1021/ja00072a025
9. Kagan, C.R., Murray, C.B., and Bawendi, M.G., Phys. Rev. B-Condens Matter 54 (12), 86338643 (1996).10.1103/PhysRevB.54.8633
10. Empedocles, S.A., Norris, D.J., and Bawendi, M.G., Phys. Rev. Lett. 77 (18), 38733876 (1996).10.1103/PhysRevLett.77.3873
11. Klimov, V.I. and McBranch, D.W., Phys. Rev. B-Condens Matter 55 (19), 1317313179 (1997).10.1103/PhysRevB.55.13173
12. Hoheisel, W., Colvin, V.L., Johnson, C.S., and Alivisatos, A.P., J. Chem. Phys. 101 (10), 84558460 (1994).10.1063/1.468107
13. Micic, O.I., Jones, K.M., Cahill, A., and Nozik, A.J., J. Phys. Chem. B 102, 97919796 (1998).10.1021/jp981703u
14. Noolandi, J. and Hong, K.M., J. Chem. Phys. 70 (7), 32303236 (1979).10.1063/1.437912
15. Nirmal, M., Dabbousi, B.O., Bawendi, M.G., Macklin, J.J., Trautman, J.K., Harris, T.D., and Brus, L.E., Nature 383 (6603), 802804 (1996).10.1038/383802a0
16. Efros, A.L. and Rosen, M., Phys. Rev. Lett. 78 (6), 11101113 (1997).10.1103/PhysRevLett.78.1110
17. Wang, Y. and Herron, N., J. Lumines. 70, 4859 (1996).10.1016/0022-2313(96)00043-9
18. Greenham, N.C., Peng, X.G., and Alivisatos, A.P., Phys. Rev. B-Condens Matter 54 (24), 1762817637 (1996).10.1103/PhysRevB.54.17628
19. Guyot-Sionnest, P., Shim, M., Matranga, C., and Hines, M., (submitted to Phys. Rev. Lett. November 1998).
20. Ben-Chorin, M., Ovadyahu, Z., and Pollak, M., Phys. Rev. B-Condens Matter 48, 15025–34 (1993).10.1103/PhysRevB.48.15025
21. Martinez-Arizala, G., Christiansen, C., Grupp, D.E., Markovic, N., Mack, A.M., and Goldman, A.M., Phys. Rev. B-Condens Matter 57, R6702 (1998).10.1103/PhysRevB.57.R670

Charge Generation and Transport in CdSe Semiconductor Quantum Dot Solids

  • C. A. Leatherdale (a1), N.Y. Morgan (a2), C. R. Kagan (a1), S. A. Empedocles (a1), M. G. Bawendi (a1) and M. A. Kastner (a2)...


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed