“Mechanically robust and stretchable organic solar cells plasticized by small-molecule acceptors” (2025), by Zhenye Wang et al. Engineering research paper. Original abstract below, unchanged. No free PDF was found.

Mechanically robust and stretchable organic solar cells plasticized by small-molecule acceptors

Zhenye Wang, Zhenye Wang, Di Zhang et al. · January 23, 2025 · Engineering

Abstract

Emerging wearable devices would benefit from integrating ductile photovoltaic light-harvesting power sources. In this work, we report a small-molecule acceptor (SMA), also known as a non–fullerene acceptor (NFA), designed for stretchable organic solar cell ( s -OSC) blends with large mechanical compliance and performance. Blends of the organosilane-functionalized SMA BTP-Si4 with the polymer donor PNTB6-Cl achieved a power conversion efficiency (PCE) of >16% and ultimate strain (ε u ) of >95%. Typical SMAs suppress OSC blend ductility, but the addition of BTP-Si4 enhances it. Although BTP-Si4 is less crystalline than other SMAs, it retains considerable electron mobility and is highly miscible with PNTB6-Cl and is essential for enhancing ε u . Thus, s -OSCs with PCE > 14% and operating normally under various deformations (>80% PCE retention under an 80% strain) were demonstrated. Analysis of several SMA-polymer blends revealed general molecular structure–miscibility–stretchability relationships for designing ductile blends.

Source page DOI: 10.1126/science.adp9709