Open AccessHeat transfer in photovoltaic polymers and bulk‐heterojunctions investigated by scanning photothermal deflection technique
Author(s) -
Chiu Ka Lok,
Ho Johnny Ka Wai,
Zhang Chujun,
Cheung Sin Hang,
Yin Hang,
Chan Mau Hing,
So Shu Kong
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000226
Subject(s) - materials science , organic semiconductor , thermal diffusivity , semiconductor , optoelectronics , heterojunction , polymer , nanotechnology , phonon , photothermal therapy , chemical physics , composite material , thermodynamics , condensed matter physics , chemistry , physics
Organic semiconductors in electronic devices usually have poor thermal conduction which could trap considerable amount of heat, inducing operational instability and reducing device lifetime, limiting commercialization potential. Despite the technological essence to understand and enhance device heat‐dissipation, related studies on organic semiconductors are very limited. In this study, the authors show that the scanning photothermal deflection technique can be employed to study the thermal transport in thin films of organic photovoltaic (OPV) polymers and bulk‐heterojunctions (BHJs), with a simple empirical correction for the extrinsic experimental configuration. Phonons are identified to dominate the thermal transport due to the low carrier mobility. For OPV semiconductors, the positive correlation between the thermal diffusivity and the molecular planarity, π – π stacking and crystallinity is demonstrated. High‐performance 2D polymers such as PM6 can possess values comparable to alloys like stainless steel. In BHJs, using a polymeric acceptor can retain high thermal diffusivities compared to fullerene and ITIC acceptors, attributed to the efficient heat transfer within the polymer chains. The results offer not only a simple, highly customizable but sensitive experimental method for thermal transport in OPV systems, but also insights into the phonon dynamics and clinical investigations for thermal stability, pushing forward strategic material design.