In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells
Year: 2024
Type: article
Abstract: ABSTRACT Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells (all-PSCs), a promising photovoltaic technology towards multi-scenario application. Although the nano-fibrillar network of the active layer induced by additive treatment is confirmed as the key factor for power conversion efficiency (PCE) of all-PSCs, its formation mechanism is not clearly revealed, for lack of precise and convincing real-time observation of crystallization and phase separation during the liquid-to-solid transition process of spin-coating. Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering (GIWAXS/GISAXS) screening that reveals the fact that naphthalene derived solid additives can suppress the aggregation of the polymer acceptor (PY-IT) at the beginning stage of spin coating, which provides sufficient time and space for the polymer donor (PM6) to form the fibril structure. Moreover, guided by this knowledge, a ternary all-polymer system is proposed, which achieves cutting-edge level PCEs for both small-area (0.04 cm2) (also decent operational stability) and large-area (1 cm2) devices.
Source: National Science Review
DOI: 10.1093/nsr/nwae384
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,100
Funders: Salt Science Research Foundation, National Natural Science Foundation of China, Hong Kong Polytechnic University, Guangdong Science and Technology Department, Science, Technology and Innovation Commission of Shenzhen Municipality, State Key Laboratory of Polymer Materials Engineering, Sichuan Province Science and Technology Support Program, Guangzhou Municipal Science and Technology Project, Beijing Synchrotron Radiation Facility
OpenAlex ID: W4404028247