Details

Autor(en) / Beteiligte

• Kim, Min Soo
• Jang, Woongsik
• Nguyen, Thuc‐Quyen
• Wang, Dong Hwan

Titel

Morphology Inversion of a Non‐Fullerene Acceptor Via Adhesion Controlled Decal‐Coating for Efficient Conversion and Detection in Organic Electronics

Ist Teil von

• Advanced functional materials, 2021-09, Vol.31 (38), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Wiley Online Library

Beschreibungen/Notizen

• In this study, a promising film formation technique is highlighted, named mold‐assisted decal‐coating, as a thin film transfer printing process using the polyurethane acrylate‐based stamping mold. By optimizing the surface energy of the mold with wetting coefficient theory, the mold‐assisted decal‐coating process is successfully demonstrated by transferring the photoactive layer composed of the polymer donor, poly[4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b;4,5‐b′]dithiophene‐2,6‐diyl‐alt‐(4‐(2‐ethylhexyl)‐3‐fluorothieno[3,4‐b]thiophene‐)‐2‐carboxylate‐2‐6‐diyl)] and a narrow bandgap non‐fullerene acceptor (NFA), 2,2′‐[[4,4,9,9‐tetrakis(4‐hexylphenyl)‐4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl]bis[[4‐[(2‐ethylhexyl)oxy]‐5,2‐thiophenediyl]methylidyne(5,6‐difluoro‐3‐oxo‐1H‐indene‐2,1(3H)‐diylidene)]]bis[propanedinitrile]. This process induces a well‐ordered morphology of photoactive material, prevents damage to the underlying layer by suppressing the solvent penetration. Both photovoltaic cells and photodetectors prepared by the decal‐coated photoactive layers containing fluorinated NFAs showed higher performance (power conversion efficiency = 10.69% and specific detectivity = 1.27 × 1012 A cm Hz1/2 W−1, respectively) than those of cells prepared by the spin‐coating method owing to morphology inversion and smoother interface that led to suppressed internal resistance and enhanced charge flow in normal structure. Thus, the reproducible decal‐coating process using a customized elastomeric mediator is an important thin film coating technique for efficient next‐generation organic optoelectronic materials. A mold‐assisted decal‐coating process is developed by controlling the surface energy of polymer molds by calculating for adhesion based on a wetting coefficient. The mold‐assisted decal‐coating contributes to higher performance of both photovoltaic device and photodetector than that of the spin‐coated device. The decal‐coated device reveals a favorable charge transfer property and suppressed morphological change over time due to morphology inversion and stabilization.