Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV-vis Spectroscopy.

Camilla Lindqvist; Ergang Wang; Mats R. Andersson; Christian Muller

doi:10.1002/macp.201300717

Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV-vis Spectroscopy.

Camilla Lindqvist
, Ergang Wang
, Mats R. Andersson
, Christian Muller

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

A simple technique is demonstrated based on UV-vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (T_g) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the T_g. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene-quinoxaline and a thiophene-isoindigo copolymer, respectively. High T_gs of 115 and 145 °C promise good thermal stability. UV-vis spectroscopy is used to monitor the onset of fullerene crystallization in polymer:fullerene bulk-heterojunction blends. Micrometer-sized fullerene crystals grow during thermal annealing and scatter light, which can serve as a clear indicator for the upper limit of the glass-transition temperature of the blend.

Original language	English
Pages (from-to)	530-535
Number of pages	6
Journal	Macromolecular Chemistry and Physics
Volume	215
Issue number	6
DOIs	https://doi.org/10.1002/macp.201300717
Publication status	Published - Mar 2014

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

bulk heterojunctions
crystal growth
glass transition temperature
organic photovoltaics
UV-vis spectroscopy

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10.1002/macp.201300717

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@article{08ccbd00044148c0b9cb21df31631ed2,

title = "Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV-vis Spectroscopy.",

abstract = "A simple technique is demonstrated based on UV-vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (Tg) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the Tg. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene-quinoxaline and a thiophene-isoindigo copolymer, respectively. High Tgs of 115 and 145 °C promise good thermal stability. UV-vis spectroscopy is used to monitor the onset of fullerene crystallization in polymer:fullerene bulk-heterojunction blends. Micrometer-sized fullerene crystals grow during thermal annealing and scatter light, which can serve as a clear indicator for the upper limit of the glass-transition temperature of the blend.",

keywords = "bulk heterojunctions, crystal growth, glass transition temperature, organic photovoltaics, UV-vis spectroscopy",

author = "Camilla Lindqvist and Ergang Wang and Andersson, \{Mats R.\} and Christian Muller",

year = "2014",

month = mar,

doi = "10.1002/macp.201300717",

language = "English",

volume = "215",

pages = "530--535",

journal = "Macromolecular Chemistry and Physics",

issn = "1022-1352",

publisher = "Wiley-VCH Verlag",

number = "6",

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TY - JOUR

T1 - Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV-vis Spectroscopy.

AU - Lindqvist, Camilla

AU - Wang, Ergang

AU - Andersson, Mats R.

AU - Muller, Christian

PY - 2014/3

Y1 - 2014/3

N2 - A simple technique is demonstrated based on UV-vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (Tg) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the Tg. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene-quinoxaline and a thiophene-isoindigo copolymer, respectively. High Tgs of 115 and 145 °C promise good thermal stability. UV-vis spectroscopy is used to monitor the onset of fullerene crystallization in polymer:fullerene bulk-heterojunction blends. Micrometer-sized fullerene crystals grow during thermal annealing and scatter light, which can serve as a clear indicator for the upper limit of the glass-transition temperature of the blend.

AB - A simple technique is demonstrated based on UV-vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (Tg) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the Tg. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene-quinoxaline and a thiophene-isoindigo copolymer, respectively. High Tgs of 115 and 145 °C promise good thermal stability. UV-vis spectroscopy is used to monitor the onset of fullerene crystallization in polymer:fullerene bulk-heterojunction blends. Micrometer-sized fullerene crystals grow during thermal annealing and scatter light, which can serve as a clear indicator for the upper limit of the glass-transition temperature of the blend.

KW - bulk heterojunctions

KW - crystal growth

KW - glass transition temperature

KW - organic photovoltaics

KW - UV-vis spectroscopy

UR - https://www.scopus.com/pages/publications/84896549242

U2 - 10.1002/macp.201300717

DO - 10.1002/macp.201300717

M3 - Article

SN - 1022-1352

VL - 215

SP - 530

EP - 535

JO - Macromolecular Chemistry and Physics

JF - Macromolecular Chemistry and Physics

IS - 6

ER -

Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV-vis Spectroscopy.

Abstract

UN SDGs

Keywords

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