文档介绍：ECS 210th Meeting, Abstract
Excitonic Solar Cells: Exciton Formation, the activation energy for transport, Eaµ, and the activation
Doping, and Carrier Transport anic energy for emission of a dopant electron from its
Photovoltaic Cells Coulomb potential well near the bound cation, Ean, Figure
2. Many results in the literature can be semi-
Brian A. Gregg
quantitatively described by considering the simple
National Renewable Energy Laboratory
conceptual model for carrier transport shown in Figure 2.
Golden, Colorado USA
Excitonic semiconductors, XSCs, are possible
replacements for the expensive, heavy and inflexible
anic semiconductors presently employed to
transform a flux of photons into a flux of electrons. This
task requires neither megaherz switching speeds nor high
carrier mobility. Silicon is overkill. Excitonic (primarily
organic) semiconductors can be mechanistically and
mathematically distinguished from conventional
semiconductors like silicon. Although such differences
are ing understood, the rational design of efficient
organic photovoltaic cells is still a matter of speculation.
1
Our studies of XSCs have led to some improved Figure 2. Schematic 1-dimensional potential
understanding of the fundamental photoconversion energy diagram under an applied field showing the
mechanism in these mate