EU PVSEC Programme Online
35th EU PVSEC 2018, 24 - 28 September 2018, Brussels
Presentation: 1AO.1.2 Control of Hot Carriers in Type-II Quantum Well Solar Cell Absorbers
Type: Oral
Date: Monday, 24th September 2018
13:30 - 15:00
Location / Room: SQUARE - Brussels Meeting Centre Level 0 / Copper Hall
Author(s): H. Esmaielpour, V.R. Whiteside, H. Piyathilaka, S. Vijeyaragunathan, B. Wang, T.D. Mishima, K.P. Roberts, A.D. Bristow, M.B. Santos, I.R. Sellers
Presenter / Speaker: I.R. Sellers, University of Oklahoma, Norman, USA
Event: Conference Conference
Session: 1AO.1 Fundamental Studies
Type(s) of Access:  Conference Registration
Topic: 1. 1 Fundamental Studies
Summary / Abstract: Hot carrier distributions generated by the absorption of high-energy photons typically thermalize rapidly via various phonon-mediated relaxation processes. In this submission, it will be shown that type-II band structures allow the possibility to manipulate this non-equilibrium carrier distribution, independent of the phononic dispersion of the constituent materials. Moreover, it will be shown that the reduced overlap between electron and hole wave functions in type-II quantum wells (QWs) plays a critical role in hot carrier thermalization in these systems. Current-voltage characteristics of a multiple-QW p-i-n structure demonstrate enhanced hot carrier photocurrent extraction with increasing optical excitation power. Specifically, the elevated thermal energy of the carrier distribution induced by increase excitation power results in the tunneling of hot electrons from the QW and increased photo carrier collection.