Azulene Bridged π-Distorted Chromophores: The Influence of Structural Symmetry on Optoelectrochemical and Photovoltaic Parameters.
Chempluschem
; 86(10): 1451-1460, 2021 Sep 30.
Article
en En
| MEDLINE
| ID: mdl-34648248
ABSTRACT
Conjugated chromophores possessing π-twisted functionality such as tetracyanobutadiene (TCBD) have emerged as promising active layer materials for organic photovoltaics (OPVs). In this study, we disclose the synthesis of two azulenyl chromophores containing one and two TCBD groups. The symmetrical and unsymmetrical structural characteristics of these molecules inflict dissimilar optoelectronic and electrochemical properties. Based on molar absorptivity, aggregation behavior, HOMO-LUMO energies and other quantum chemical parameters, the symmetrical molecule (TATC2) appears to be a better non-fullerene acceptor (NFA) compared to its unsymmetrical counterpart (TATC1). For instance, higher absorptivity and deeper HOMO-LUMO levels for TATC2 (23950â
M-1 cm-1 ; -6.01â
eV/-3.86â
eV) over TATC1 (12200â
M1 cm-1 ; -5.46â
eV/-3.64â
eV) was observed. Validating this structure-property relationship on solar cell prototypes exhibited higher photovoltaic parameters (VOC =0.54â
V, FF=0.48, JSC =6.42â
mA/cm2 ) for TATC2 than TATC1 (VOC =0.47â
V, FF=0.38, JSC =5.77â
mA/cm2 ). Though the device parameters are not high, this work uncovers the intrinsic properties of azulene-tethered twisted chromophores as potential π-semiconductor choice for NFA solar cells. In particular, this report explores the utility of azulene-based π-twisted semiconductors as acceptor material for OPVs with cell efficiencies of 1.70 and 1.04 % for TATC2 and TATC1 respectively.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Chempluschem
Año:
2021
Tipo del documento:
Article
País de afiliación:
India