In this section
@article{Yang:2026:10.1002/aenm.71553,
author = {Yang, EJ and Park, SY and Qiu, VY and Kim, J},
doi = {10.1002/aenm.71553},
journal = {Advanced Energy Materials},
title = {Free Charge Generation in Organic Photoconversion Devices–the Impact of Electrostatic Potentials},
url = {http://dx.doi.org/10.1002/aenm.71553},
year = {2026}
}
TY - JOUR
AB - <jats:title>ABSTRACT</jats:title> <jats:p>The generation of free charges in organic semiconductors is fundamentally limited by the formation of tightly bound electronhole pairs (excitons) arising from their low dielectric screening. Conventional donor/acceptor (D/A) heterojunctions overcome this limitation through interfacial energetic offsets at the cost of high voltage losses that limit organic photoconversion device efficiency compared to inorganic counterparts. The success of nonfullerene acceptors (NFAs), enabling efficient charge generation at relatively small energetic offsets, challenges this picture and suggests the need to consider additional charge generation mechanisms. In this review, we highlight the critical role of molecular electrostatic potentials in free charge generation within organic semiconductors. The molecular origins of electrostatic potentials are discussed within the multipole expansion framework, with particular emphasis on quadrupole moments arising from anisotropic charge distributions within a molecule. The role of these electrostatic effects in modulating interfacial energetics, inducing band bending, and facilitating charge separation in donor/acceptor heterojunctions is examined, alongside their extension to singlecomponent systems. In singlecomponent systems, orientationdependent molecular packing creates functional energetic offsets without the need for distinct donor and acceptor materials. Based on these observations, key molecular and device design strategies for harnessing electrostatic effects in nextgeneration organic photoconversion devices are outlined.</jats:p>
AU - Yang,EJ
AU - Park,SY
AU - Qiu,VY
AU - Kim,J
DO - 10.1002/aenm.71553
PY - 2026///
SN - 1614-6832
TI - Free Charge Generation in Organic Photoconversion Devices–the Impact of Electrostatic Potentials
T2 - Advanced Energy Materials
UR - http://dx.doi.org/10.1002/aenm.71553
UR - https://doi.org/10.1002/aenm.71553
ER -
