Elastic PEDOT:PSS composite with Conjugated Polyelectrolyte for Stretchable Organic Solar Cells
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Organic Solar Cells (OSCs) have various layers including electrodes, Hole Transport Layers (HTLs), Active Layers, and Electron Transport Layers. The most commonly used material for HTL is PEDOT:PSS, consisting of conducting PEDOT and insulating PSS.1 But It has a rigid property because of high crystallinity. Therefore, we synthesized Conjugated Polyelectrolyte (CPE) based CPEK-90 consisting of CPE-K and PDCA units.2 It can improve stretchability of PEDOT:PSS, enabling noncovalent bonding between PEDOT:PSS and PDCA.3 We mixed PEDOT:PSS and CPEK-90 materials according to the amount of PEDOT:PSS solid content and used them to fabricate OSCs devices. When CPEK-90 was added 30wt%, power conversion efficiency (PCE) recorded 14.77%, which is a decrease within 10% of PEDOT:PSS. And we investigate the stretchability of HTLs measuring sheet resistance, which confirmed that PEDOT:PSS and CPEK-90 contained 30wt% increased by 333% and 36%, respectively, during 80 cycles at 100% elongation. (1) S. Kee et al., Adv. Mater., 28, 8625 (2016). (2) H. Choi et al., Nat. Commun., 6, 7348 (2015). (3) J. Oh et al., ACS, 539, 411 (2016).