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Following in Operando the Structure Evolution‐Induced Degradation in Printed Organic Solar Cells with Nonfullerene Small Molecule Acceptor
Author(s) -
Wienhold Kerstin S.,
Chen Wei,
Yin Shanshan,
Guo Renjun,
Schwartzkopf Matthias,
Roth Stephan V.,
Müller-Buschbaum Peter
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000251
Subject(s) - organic solar cell , acceptor , polymer solar cell , materials science , degradation (telecommunications) , conjugated system , polymer , active layer , molecule , chemical engineering , photochemistry , energy conversion efficiency , layer (electronics) , chemistry , nanotechnology , optoelectronics , organic chemistry , composite material , physics , telecommunications , computer science , engineering , condensed matter physics , thin film transistor
Understanding the degradation mechanisms of printed bulk‐heterojunction (BHJ) organic solar cells during operation is essential to achieve long‐term stability and realize real‐world applications of organic photovoltaics. Herein, the degradation of printed organic solar cells based on the conjugated benzodithiophene polymer PBDB‐T‐SF and the nonfullerene small molecule acceptor IT‐4F with 0.25 vol% 1,8‐diiodooctane (DIO) solvent additive is studied in operando for two different donor:acceptor ratios. The inner nano‐morphology is analyzed with grazing incidence small angle X‐ray scattering (GISAXS), and current–voltage ( I–V ) characteristics are probed simultaneously. Irrespective of the mixing ratio, degradation occurs by the same degradation mechanism. A decrease in the short‐circuit current density ( J SC ) is identified to be the determining factor for the decline of the power conversion efficiency. The decrease in J SC is induced by a reduction of the relative interface area between the conjugated polymer and the small molecule acceptor in the BHJ structure, resembling the morphological degradation of the active layer.