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Ternary Blend Strategy for Achieving High‐Efficiency Organic Photovoltaic Devices for Indoor Applications
Author(s) -
Singh Ranbir,
Shin SangChul,
Lee Hansol,
Kim Min,
Shim Jae Won,
Cho Kilwon,
Lee JaeJoon
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201900041
Subject(s) - ternary operation , materials science , diimide , perylene , energy conversion efficiency , crystallinity , absorption (acoustics) , organic solar cell , miscibility , small molecule , chemical engineering , molecule , analytical chemistry (journal) , optoelectronics , organic chemistry , polymer , chemistry , composite material , biochemistry , computer science , engineering , programming language
Monomeric perylene diimide (PDI) small molecules display a high absorption coefficient and crystallinity in solid‐state thin films due to strong π–π interactions between the molecules. To take advantage of these exciting properties of PDIs, N , N '‐bis(1‐ethylpropyl)perylene‐3,4,9,10‐tetracarboxylic diimide (EP‐PDI) was mixed with a binary blend of PTB7 and PC 71 BM to fabricate an efficient ternary blend, which were in turn used to produce organic photovoltaic (OPV) devices well suited to indoor applications (PTB7=poly({4,8‐bis[(2‐ethylhexyl)oxy]benzo[1,2‐ b :4,5‐ b ′]dithiophene‐2,6‐diyl}{3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3,4‐ b ]thiophenediyl}), PC 71 BM=[6,6]‐phenyl‐C 71 ‐butyric acid methyl ester). We varied the PC 71 BM/EP‐PDI weight ratio to investigate the influence of EP‐PDI on the optical, electrical, and morphological properties of the PTB7:PC 71 BM:EP‐PDI ternary blend. Compared with the reference PTB7:PC 71 BM binary blend, the ternary blends showed strong optical absorption in the wavelength range in which the spectra of indoor LED lamps show their strongest peaks. The addition of EP‐PDI to the binary blend was found to play an important role in altering the morphology of the blend in such a way as to facilitate charge transport in the resulting ternary blend. Apparently, as a result, the optimal PTB7:PC 71 BM:EP‐PDI‐based inverted OPV device exhibited a power conversion efficiency (PCE) of 15.68 %, a fill factor (FF) of 68.5 %, and short‐circuit current density ( J SC ) of 56.7 μA cm −2 under 500 lx (ca. 0.17 mW cm −2 ) indoor LED light conditions.