Slower carriers limit charge generation in organic semiconductor light-harvesting systems.

Abstract:

:Blends of electron-donating and -accepting organic semiconductors are widely used as photoactive materials in next-generation solar cells and photodetectors. The yield of free charges in these systems is often determined by the separation of interfacial electron-hole pairs, which is expected to depend on the ability of the faster carrier to escape the Coulomb potential. Here we show, by measuring geminate and non-geminate losses and key transport parameters in a series of bulk-heterojunction solar cells, that the charge-generation yield increases with increasing slower carrier mobility. This is in direct contrast with the well-established Braun model where the dissociation rate is proportional to the mobility sum, and recent models that underscore the importance of fullerene aggregation for coherent electron propagation. The behaviour is attributed to the restriction of opposite charges to different phases, and to an entropic contribution that favours the joint separation of both charge carriers.

journal_name

Nat Commun

journal_title

Nature communications

authors

Stolterfoht M,Armin A,Shoaee S,Kassal I,Burn P,Meredith P

doi

10.1038/ncomms11944

subject

Has Abstract

pub_date

2016-06-21 00:00:00

pages

11944

issn

2041-1723

pii

ncomms11944

journal_volume

7

pub_type

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