Bimolecular Crystals with an Intercalated Structure Improve Poly(p‐phenylenevinylene)‐Based Organic Photovoltaic Cells

• DOI: 10.1002/cssc.201402813
• Publication Date: 2014-11-28T14:30:11Z
• Authors: Kyung‐Geun Lim; Jun‐Mo Park; Hannah Mangold; Frédéric Laquai; Tae‐Lim Choi; Tae‐Woo Lee
• Keywords: Electron Mobility; Charge carrier; Crystal (programming language)

Abstract The exciton dissociation, recombination, and charge transport of bulk heterojunction organic photovoltaic cells (OPVs) is influenced strongly by the nanomorphology blend, such as grain size molecular packing. Although it well known that polymers based on amorphous poly( p ‐phenylenevinylene) (PPV) have a fundamental limit to their efficiency because low carrier mobility, which leads increased recombination unbalanced extraction, herein, we demonstrate issue can be overcome forming bimolecular crystals an PPV‐based polymer:phenyl‐C 61 ‐butyric acid methyl ester (PCBM) intercalated structure. We used poly(2,5‐dioctyloxy‐ ‐phenylene vinylene‐ alt ‐2′,5′‐thienylene vinylene) (PPVTV), has simple chemical A reasonably high power conversion (∼3.5 %) was obtained, although material intrinsically structure relatively large band gap (2.0 eV). correlation between well‐ordered crystal PPVTV:PCBM improved hole mobility film compared pristine PPVTV using 2 D grazing incidence XRD space‐charge‐limited current measurements. Furthermore, show in high‐performance OPVs related optimum packing, blending ratio, side‐chain length, weight polymer. Improved fast sweep out charges thus suppression nongeminate under operating conditions.