Delayed Crystallization Kinetics Allowing High-Efficiency All-Polymer Photovoltaics with Superior Up-Scaled Manufacturing.

Though encouraging performance has been achieved in small-area organic photovoltaics (OPVs), reducing efficiency loss when evoluted to large-area modules is an important but unsolved issue. Considering that polymer materials show benefits in film-forming processability and mechanical robustness, a high-efficiency all-polymer OPV module has been demonstrated in this work. First, a ternary blend consisting of two polymer donors, PM6 and PBQx-TCl, and one polymer acceptor, PY-IT, was developed, with which triplet state recombination was suppressed for a reduced energy loss, thus allowing a higher voltage; and donor-acceptor miscibility was compromised for enhanced charge transport, thus resulting improved photocurrent and fill factor, all these contributed to a champion efficiency of 19% for all-polymer OPVs. Second, the delayed crystallization kinetics from solution to film solidification was achieved that gives a longer operation time window for optimized blend morphology in large-area module, thus relieving the loss of fill factor and allowing a record efficiency of 16.26% on an up-scaled module with an area of 19.3 cm 2 . Besides, this all-polymer system also showed excellent mechanical stability. Our work demonstrates that all-polymer ternary systems are capable of solving the up-scaled manufacturing issue, thereby enabling high-efficiency OPV modules. This article is protected by copyright. All rights reserved.