In this section
@article{Fu:2024:10.1039/d4ee02961e,
author = {Fu, Y and Xu, L and Li, Y and Yang, EJ and Guo, Y and Cai, G and Chan, PF and Ke, Y and Su, CJ and Jeng, US and Chow, PCY and Kim, JS and Tang, MC and Lu, X},
doi = {10.1039/d4ee02961e},
journal = {Energy and Environmental Science},
title = {Enhancing inter-domain connectivity by reducing fractal dimensions: the key to passivating deep traps in organic photovoltaics},
url = {http://dx.doi.org/10.1039/d4ee02961e},
year = {2024}
}
TY - JOUR
AB - The detrimental impact of non-geminate recombination on high-performance organic photovoltaics has been recognised and primarily attributed to bimolecular recombination. However, the recent surge in Y-series acceptor-based systems has drawn attention to deep-trap-assisted monomolecular recombination. This study reveals the morphological origin of deep traps in the prototypical PM6:Y6 system, identifying isolated crystalline and amorphous Y6 domains as key contributors. The findings underscore the importance of improving inter-acceptor domain connectivity for effective trap passivation. For the first time, we have pinpointed a crucial metric for inversely quantifying the inter-acceptor domain connectivity: the crystalline domain fractal dimension (Df). Due to the self-similar nature of fractal structures, the fractal dimension propagates across multi-length scales and can be controlled by tuning local intermolecular aggregation motifs. Remarkably, combining diiodide benzene (DIB) as the additive and layer-by-layer (LBL) processing effectively promotes the more extended backbone order of Y6 molecules, consequently reducing the fractal dimensions and passivating deep traps. By applying this strategy to another high-performance system, D18:L8BO, a benchmark efficiency of 19.6% is achieved, among the highest efficiencies reported for LBL OPVs.
AU - Fu,Y
AU - Xu,L
AU - Li,Y
AU - Yang,EJ
AU - Guo,Y
AU - Cai,G
AU - Chan,PF
AU - Ke,Y
AU - Su,CJ
AU - Jeng,US
AU - Chow,PCY
AU - Kim,JS
AU - Tang,MC
AU - Lu,X
DO - 10.1039/d4ee02961e
PY - 2024///
SN - 1754-5692
TI - Enhancing inter-domain connectivity by reducing fractal dimensions: the key to passivating deep traps in organic photovoltaics
T2 - Energy and Environmental Science
UR - http://dx.doi.org/10.1039/d4ee02961e
ER -
