Abstract
In this study we report on a series of 12 small molecular p-type penta- and hexathiophene semiconductors end-capped with either malononitrile (MN), hexyl rhodanine (HR) or dicyano hexyl rhodanine (CHR) acceptors and functionalized with alkyl sidechains of two different lengths, orientated away from the central core in a regioregular manner. Organic photovoltaic devices were fabricated, and annealed using conditions optimized for each material to produce a wide range of power-conversion efficiencies (PCEs) from 1-8%. We find that achieving high PCEs is critically dependent on matching the conjugation length to specific end-group acceptors, and also find a slight correlation between improved performances and longer sidechains. To understand this behavior we performed an in-depth analysis of the structure-property relationships of these materials on intermolecular packing through grazing-incidence wide-angle X-ray scattering (GIWAXS) studies, which yielded several key relationships between molecular structure, bulk crystallinity and optoelectronic properties.
| Original language | English |
|---|---|
| Pages (from-to) | 567-580 |
| Number of pages | 14 |
| Journal | Journal of Materials Chemistry C |
| Volume | 8 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 14 Jan 2020 |
Cite this
}
A structural study of p-type A-D-A oligothiophenes : effects of regioregular alkyl sidechains on annealing processes and photovoltaic performances. / Lee, Calvin J.; Jradi, Fadi M.; Mitchell, Valerie D.; White, Jonathan; McNeill, Christopher R.; Subbiah, Jegadesan; Marder, Seth; Jones, David J.
In: Journal of Materials Chemistry C, Vol. 8, No. 2, 14.01.2020, p. 567-580.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - A structural study of p-type A-D-A oligothiophenes
T2 - effects of regioregular alkyl sidechains on annealing processes and photovoltaic performances
AU - Lee, Calvin J.
AU - Jradi, Fadi M.
AU - Mitchell, Valerie D.
AU - White, Jonathan
AU - McNeill, Christopher R.
AU - Subbiah, Jegadesan
AU - Marder, Seth
AU - Jones, David J.
PY - 2020/1/14
Y1 - 2020/1/14
N2 - In this study we report on a series of 12 small molecular p-type penta- and hexathiophene semiconductors end-capped with either malononitrile (MN), hexyl rhodanine (HR) or dicyano hexyl rhodanine (CHR) acceptors and functionalized with alkyl sidechains of two different lengths, orientated away from the central core in a regioregular manner. Organic photovoltaic devices were fabricated, and annealed using conditions optimized for each material to produce a wide range of power-conversion efficiencies (PCEs) from 1-8%. We find that achieving high PCEs is critically dependent on matching the conjugation length to specific end-group acceptors, and also find a slight correlation between improved performances and longer sidechains. To understand this behavior we performed an in-depth analysis of the structure-property relationships of these materials on intermolecular packing through grazing-incidence wide-angle X-ray scattering (GIWAXS) studies, which yielded several key relationships between molecular structure, bulk crystallinity and optoelectronic properties.
AB - In this study we report on a series of 12 small molecular p-type penta- and hexathiophene semiconductors end-capped with either malononitrile (MN), hexyl rhodanine (HR) or dicyano hexyl rhodanine (CHR) acceptors and functionalized with alkyl sidechains of two different lengths, orientated away from the central core in a regioregular manner. Organic photovoltaic devices were fabricated, and annealed using conditions optimized for each material to produce a wide range of power-conversion efficiencies (PCEs) from 1-8%. We find that achieving high PCEs is critically dependent on matching the conjugation length to specific end-group acceptors, and also find a slight correlation between improved performances and longer sidechains. To understand this behavior we performed an in-depth analysis of the structure-property relationships of these materials on intermolecular packing through grazing-incidence wide-angle X-ray scattering (GIWAXS) studies, which yielded several key relationships between molecular structure, bulk crystallinity and optoelectronic properties.
UR - http://www.scopus.com/inward/record.url?scp=85077501611&partnerID=8YFLogxK
U2 - 10.1039/c9tc05280a
DO - 10.1039/c9tc05280a
M3 - Article
AN - SCOPUS:85077501611
VL - 8
SP - 567
EP - 580
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
SN - 2050-7526
IS - 2
ER -