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A Cross‐Linkable Electron‐Transport Layer Based on a Fullerene−Benzoxazine Derivative for Inverted Polymer Solar Cells
Author(s) -
Vittala Sandeepa Kulala,
Ravi Remya,
Deb Biswapriya,
Joseph Joshy
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000354
Subject(s) - materials science , fullerene , polymer solar cell , energy conversion efficiency , moiety , heterojunction , polymer , chemical engineering , solar cell , active layer , layer (electronics) , polymer chemistry , nanotechnology , optoelectronics , organic chemistry , chemistry , composite material , engineering , thin film transistor
The synthesis, optoelectronic characterization and device properties of a cross‐linkable fullerene derivative, [6,6]‐phenyl‐C 61 ‐butyric benzoxazine ester (PCBB) is reported. PCBB shows all the basic photophysical and electrochemical properties of the parent compound [6,6]‐phenyl‐C 61 ‐butyric methyl ester (PCBM). Thermal cross‐linking of the benzoxazine moiety in PCBB resulted in the formation of cross‐linked, solvent resistive adhesive films (C−PCBB). Atomic force microscopy (AFM) and optical microscopic studies showed dramatic reduction in the roughness and aggregation behaviour of P3HT‐PCBM polymer blend film upon incorporation of C−PCBB interlayer. An inverted bulk heterojunction solar cell based on the configuration ITO/ZnO/C−PCBB/P3HT‐PCBM/V 2 O 5 /Ag achieved 4.27 % power conversion efficiency (PCE) compared to the reference device ITO/ZnO/P3HT‐PCBM/V 2 O 5 /Ag (PCE=3.28 %). This 25 % increase in the efficiency is due to the positive effects of C‐PCBB on P3HT/C‐PCBB and PCBM/C‐PCBB heterojunctions.
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