Organic Photovoltaics: Revealing the Molecular-Scale Impact of Volatile Solid Additives in PM6:PY-DT All-Polymer Blends

Engineering notes

Engineering notes will be added by the Power for Solar editorial team.

Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

While all-polymer solar cells (all-PSCs) present superior stability and mechanical robustness with respect to their polymer:small-molecule acceptor counterparts, their power conversion efficiencies still lag behind due to unfavorable morphologies. Volatile solid additives (VSAs) have been reported to positively tune the all-PSC morphologies by slowing the solvent evaporation process. However, many aspects remain undocumented, especially regarding the impact of VSAs on nanoscale morphologies and electronic properties in all-PSCs. Here, considering the representative PM6:PY-DT blends and using 4-bromodibenzothiophene (4-BDBTP) as a prototypical VSA, we combine molecular dynamics and density functional theory to reveal how the 4-BDBTP molecules impact interactions among different active-layer components and the resulting electronic properties related to interchain hole/electron transfer rates and nonradiative recombination rates from the interfacial charge-transfer states to the ground state. Overall, our study provides a comprehensive understanding of the molecular-scale impact of VSAs and points out the requirements for novel additives to improve all-PSC efficiency.

Links and sources

Comments