James Franck Institute , 929 East 57th Street, Chicago, Illinois 60637, United States.
ACS Nano. 2014 Nov 25;8(11):11707-14. doi: 10.1021/nn505092a. Epub 2014 Oct 30.
Photoconductivity is demonstrated with monodispersed HgSe colloidal quantum dots that are illuminated with radiation resonant with 1S(e)-1P(e) intraband electronic absorption, between 3 and 5 μm. A doping of two electrons per dot gives the lowest dark current, and a detectivity of 8.5 × 10(8) Jones is obtained at 80 K. Photoluminescence of the intraband transition is also observed. The detector properties are discussed in terms of the measured photoluminescence quantum yield, the electron mobility in the 1P(e) state, and the responsivity. The intraband photoresponse allows to fully harness the quantum confined states in colloidal nanostructures, extending the prior limited use of interband transition.
用单分散 HgSe 胶体量子点展示了光电导性能，这些量子点用与 1S(e)-1P(e) 带内电子吸收共振的辐射进行辐照，波长在 3 到 5 微米之间。每个量子点掺杂两个电子给出了最低的暗电流，在 80 K 时获得了 8.5×10(8) 琼斯的探测率。还观察到了带内跃迁的光致发光。根据测量的光致发光量子产率、1P(e) 态中的电子迁移率和响应率来讨论探测器的性能。带内光响应允许充分利用胶体纳米结构中的量子限制态，扩展了先前对带间跃迁的有限使用。
