In-situ monitoring of molecular vibrations of two organic semiconductors in photovoltaic blends and their impact on thin film morphology | Zendy

Wing Chung Tsoi | Zendy; Weimin Zhang | Zendy; Joseph Razzell Hollis | Zendy; Minwon Suh | Zendy; Martin Heeney | Zendy; Iain McCulloch | Zendy; JiSeon Kim | Zendy

Open Access

In-situ monitoring of molecular vibrations of two organic semiconductors in photovoltaic blends and their impact on thin film morphology

Author(s) -

Wing Chung Tsoi,

Weimin Zhang,

Joseph Razzell Hollis,

Minwon Suh,

Martin Heeney,

Iain McCulloch,

JiSeon Kim

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4803912

Subject(s) - raman spectroscopy , materials science , crystallization , annealing (glass) , thiophene , band gap , thin film , organic semiconductor , chemical engineering , organic solar cell , analytical chemistry (journal) , polymer , nanotechnology , organic chemistry , optoelectronics , chemistry , composite material , optics , physics , engineering

We report in-situ simultaneous monitoring of molecular vibrations of two components in organic photovoltaic blends using resonant Raman spectroscopy. Blend films were composed of a low bandgap copolymer thieno[3,2-b]thiophene-diketopyrrolopyrrole (DPPTTT) and (6,6)-phenyl-C71-butyric acid ester (PC 70BM). Changes in Raman spectra associated with crystallization processes of each component and their impact on thin film morphology were studied during thermal annealing and cooling processes. Transition temperatures to crystalline phases in blends were measured at ∼150 °C and ∼170 °C for DPPTTT and PC 70BM, respectively. Such phase changes lead to modifications in local chemical composition reducing relative Raman peak intensities (IPC70BM/IDPPTTT) from ∼0.4 in PC 70BM-rich domains to ∼0.15 in homogeneous areas

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