TY  - JOUR
A1  - Ullbrich, Sascha
A1  - Benduhn, Johannes
A1  - Jia, Xiangkun
A1  - Nikolis, Vasileios C.
A1  - Tvingstedt, Kristofer
A1  - Piersimoni, Fortunato
A1  - Roland, Steffen
A1  - Liu, Yuan
A1  - Wu, Jinhan
A1  - Fischer, Axel
A1  - Neher, Dieter
A1  - Reineke, Sebastian
A1  - Spoltore, Donato
A1  - Vandewal, Koen
T1  - Emissive and charge-generating donor-acceptor interfaces for organic optoelectronics with low voltage losses
JF  - Nature materials
N2  - Intermolecular charge-transfer states at the interface between electron donating (D) and accepting (A) materials are crucial for the operation of organic solar cells but can also be exploited for organic light-emitting diodes(1,2). Non-radiative charge-transfer state decay is dominant in state-of-the-art D-A-based organic solar cells and is responsible for large voltage losses and relatively low power-conversion efficiencies as well as electroluminescence external quantum yields in the 0.01-0.0001% range(3,4). In contrast, the electroluminescence external quantum yield reaches up to 16% in D-A-based organic light-emitting diodes(5-7). Here, we show that proper control of charge-transfer state properties allows simultaneous occurrence of a high photovoltaic and emission quantum yield within a single, visible-light-emitting D-A system. This leads to ultralow-emission turn-on voltages as well as significantly reduced voltage losses upon solar illumination. These results unify the description of the electro-optical properties of charge-transfer states in organic optoelectronic devices and foster the use of organic D-A blends in energy conversion applications involving visible and ultraviolet photons(8-11).
KW  - Electronics, photonics and device physics
KW  - Optoelectronic devices and components
KW  - Photonic devices
KW  - Solar energy and photovoltaic technology
Y1  - 2019
U6  - https://doi.org/10.1038/s41563-019-0324-5
SN  - 1476-1122
SN  - 1476-4660
VL  - 18
IS  - 5
SP  - 459
EP  - 464
PB  - Nature Publ. Group
CY  - London
ER  -