Synergistic optimization of mechanical and photovoltaic properties in ternary organic solar cells from a two-donor polymer blend

Abstract

Using multiple donor polymers is a simple means to broaden the absorption range of organic solar cells (OSCs). Yet, achieving improved photovoltaic and mechanical properties in OSCs on dual polymers...

Unraveling the origin of improved photovoltaic performance in acceptor–acceptor-structured perylene-diimide-based polymeric acceptors through partially fluorinating benzo[c][1,2,5]thiadiazole

“…The miscibility and molecular interaction between polymeric acceptors PPDI-DTBT , PPDI-DTFBT and PTB7-Th were analyzed by comparing the Flory–Huggins interaction parameter ( χ D–A = ( γ D 0.5 − γ A 0.5 ) 2 ) obtained from the contact angle ( θ ) tests of pure films according to the two-solvent method utilizing water and ethylene glycol (EG). 71,76,77 The related contact angle measurements are shown in Fig. S22 (ESI†) and the corresponding parameters including surface energy ( γ ) and χ D–A are summarized in Table S7 (ESI†).…”

Polymer Acceptor with Hydrogen-Bonding Functionality for Efficient and Mechanically Robust Ternary Organic Solar Cells

“…The tensile property of the neat P A films was examined to investigate the impact of the Thy and Dap groups of the N2200-ThyDap on their stretchability. ,,− In order to exclude the impact of the substrate and elucidate the intrinsic tensile properties of the neat P A films, a pseudo-free-standing tensile test method was performed to obtain the stress–strain curve and measure the elastic moduli ( E ), COS, and toughness (Figure d,e and Table S1). N2200-ThyDap exhibited an 18-fold enhanced stretchability (COS = 28.2%) compared to N2200 (COS = 1.5%) (Figure d and Table S1).…”

“…We compared the stretchability of the blend films, which is one of the most important properties for application in wearable devices. ,− The stretchability of the blend films was also estimated from a pseudo-free-standing tensile test to quantify elastic moduli ( E ), COS, and toughness (Figures and S15, Tables and S6). The blend films were prepared by using the same conditions as for the active layer preparation in OSC fabrication.…”

Dual Polymer Complementarity Induced Truly Black Electrochromic Film and the Construction of Intelligent Eye-Protection Filters

“…Creating black-to-transparent polymer films with dual components by solution coprocessing requires the single polymer to have broader possible complementary absorption bands. Using a multidonor to build polymers is a simple way to broaden organic solar cells’ absorption range . Still, its potential in the electrochromic field remains to be explored.…”