POS5-1591
Aggregation-Suppressed Linear Donor Polymer with Deep HOMO Level for Efficient Organic Photovoltaics
Topic
S5. Polymers for Electronics and Photonics
When and Where
Oct 1, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Jinkee HONG
Ki Su KIM
Presenter(s)
JINLONG PANG (Chungnam National University)
Co-Author(s)
Abstract
We developed two wide-bandgap (WBG) donor polymers, P-BTST and P-DT-BTST, featuring a novel six-fused-ring acceptor unit (BTST) and a fluorinated FBDT donor core. The BTST unit improves backbone planarity and suppresses intramolecular charge transfer, leading to deeper HOMO levels and blue-shifted absorption. Compared to the reference polymer P-DT-BT, the BTST-based polymers show broader bandgaps, better energy alignment with Y6, and enhanced morphological order. In particular, P-BTST exhibits tighter π–π stacking and reduced aggregation, confirmed by UV–vis, AFM, and GIWAXS. These features enable a high power conversion efficiency (PCE) of 15.04%, with JSC of 26.53 mA cm⁻² and VOC of 0.83 V. This study demonstrates the potential of BTST as a building block for high-performance WBG donor polymers in organic solar cells.
