TY - GEN
T1 - Investigating polaron dynamics in PM6:Y6 films for use in organic photovoltaics using time-resolved infrared spectroscopy
AU - Swartzfager, John R.
AU - Zhang, Guoyan
AU - Wong, Stephen
AU - Gomez, Enrique D.
AU - Asbury, John B.
N1 - Publisher Copyright:
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
PY - 2021
Y1 - 2021
N2 - In the last 10 years, there has been a boom in the organic photovoltaic (OPV) community, with new devices achieving power conversion efficiencies (PCEs) of ∼18%. This significant increase in device performance is due to a switch from polymer:fullerenes, such as P3HT:PCBM, to polymer:non-fullerenes, like PM6:Y6. These films are often created with the use of solvent additives which, when correctly chosen, increase the device performance. However, because many of these polymer:non-fullerene systems have only recently been developed the exact effect that these solvent additives have on the morphology, performance and electronic properties is not well understood. Here we use a combination of photoluminescence and time-resolved spectroscopy along with grazing-incidence wide-Angle x-ray scattering to fully understand what is occurring at both an electronic and morphological level in a series of PM6:Y6 films with varying amounts of acetone used as a solvent additive. From these data we find that acetone changes the degree of mixing and crystal grain size, which leads to changes in polaron yield and recombination, which is reflected in device performance.
AB - In the last 10 years, there has been a boom in the organic photovoltaic (OPV) community, with new devices achieving power conversion efficiencies (PCEs) of ∼18%. This significant increase in device performance is due to a switch from polymer:fullerenes, such as P3HT:PCBM, to polymer:non-fullerenes, like PM6:Y6. These films are often created with the use of solvent additives which, when correctly chosen, increase the device performance. However, because many of these polymer:non-fullerene systems have only recently been developed the exact effect that these solvent additives have on the morphology, performance and electronic properties is not well understood. Here we use a combination of photoluminescence and time-resolved spectroscopy along with grazing-incidence wide-Angle x-ray scattering to fully understand what is occurring at both an electronic and morphological level in a series of PM6:Y6 films with varying amounts of acetone used as a solvent additive. From these data we find that acetone changes the degree of mixing and crystal grain size, which leads to changes in polaron yield and recombination, which is reflected in device performance.
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U2 - 10.1117/12.2594381
DO - 10.1117/12.2594381
M3 - Conference contribution
AN - SCOPUS:85117712134
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Physical Chemistry of Semiconductor Materials and Interfaces XX
A2 - Musser, Andrew J.
A2 - Baran, Derya
A2 - Nielsen, Christian
A2 - Congreve, Daniel
PB - SPIE
T2 - Physical Chemistry of Semiconductor Materials and Interfaces XX 2021
Y2 - 1 August 2021 through 5 August 2021
ER -
