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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51108808
Record Status
Checked
Record Id
51108808
Title
Graded Morphologies and the Performance of PffBT4T-2OD:PC71BM Devices Using Additive Choice
Contributors
H Gaspar
,
AJ Parnell
,
GE Pérez
,
JC Viana
,
SM King (STFC Rutherford Appleton Lab.)
,
A Mendes
,
L Pereira
,
G Bernardo
Abstract
The impact of several solvent processing additives (1-chloronaphthalene, methylnaphthalene, hexadecane, 1-phenyloctane, and p-anisaldehyde), 3% v/v in o-dichlorobenzene, on the performance and morphology of poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3‴-di(2-octyldodecyl)-2,2′,5′,22033,5″,2‴-quaterthiophen-5,5‴-diyl)] (PffBT4T-2OD):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM)-based polymer solar cells was investigated. Some additives were shown to enhance the power conversion efficiency (PCE) by ~6%, while others decreased the PCE by ~17–25% and a subset of the additives tested completely eliminated any power conversion efficiency and the operation as a photovoltaic device. Grazing-Incidence Wide Angle X-ray Scattering (GIWAXS) revealed a clear stepwise variation in the crystallinity of the systems when changing the additive between the two extreme situations of maximum PCE (1-chloronaphthalene) and null PCE (hexadecane). Small-Angle Neutron Scattering (SANS) revealed that the morphology of devices with PCE ~0% was composed of large domains with correlation lengths of ~30 nm, i.e., much larger than the typical exciton diffusion length (~12 nm) in organic semiconductors. The graded variations in crystallinity and in nano-domain size observed between the two extreme situations (1-chloronaphthalene and hexadecane) were responsible for the observed graded variations in device performance.
Organisation
ISIS
,
ISIS-LOQ
,
STFC
Keywords
SasView
,
RB1720412
Funding Information
Related Research Object(s):
Licence Information:
Creative Commons Attribution 4.0 International (CC BY 4.0)
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nanomaterials 11, no. 12 (2021): 3367.
doi:10.3390/nano11123367
2021
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