Tuning Domain-Based Charge Transfer in Organic Dyes: Impact of Heteroatom Doping on the $\pi$-Linker of Carbazole-Based Systems

TL;DR

This computational study investigates how heteroatom doping at specific positions in carbazole-based organic dyes influences charge transfer efficiency, revealing nitrogen doping as most effective for solar cell applications.

Contribution

It introduces a novel application of pair coupled cluster doubles (pCCD) to monitor and quantify domain-based charge transfer in doped organic dyes.

Findings

Charge transfer increases with higher doping levels.

Nitrogen doping yields the highest charge transfer efficiency.

Three nitrogen atoms in the bridge maximize donor-to-acceptor transfer.

Abstract

This work presents an innovative computational study of domain-based charge transfer that leverages the localized orbitals of pair coupled cluster doubles (pCCD). This method enables both directional monitoring and quantitative assessment of charge transfer among donor (D), bridge (B), and acceptor (A) moieties. We applied this approach to a series of newly designed carbazole-based prototypical organic dyes, doping the bridge at positions 1, 2, and 3 with nitrogen, oxygen, and sulfur atoms to generate mono-, di-, and tri-doped variants. Our results demonstrate a clear and progressive enhancement in charge transfer as the degree of nitrogen or oxygen doping increases from mono- to di- to tri-doped systems. For mono-doped dyes, the highest forward charge transfer from donor to bridge to acceptor (D$\xrightarrow{}$B$\xrightarrow{}$A) occurs when a heteroatom (N or O) is placed in the terminal ring of the bridge, closer to the acceptor. In di-doped dyes, the largest forward charge transfer is observed when heteroatoms occupy both terminal positions, with one atom (N or S) adjacent to the donor and the other (N) near the acceptor. Nitrogen-doped systems consistently outperform their oxygen and sulfur counterparts. Among all variants, the organic dye doped with three nitrogen atoms at the bridge exhibits the most efficient and highest directional donor-to-acceptor charge transfer (42.6%), making it the most promising candidate for potential applications in dye-sensitized solar cells. Finally, our calculations predict weak charge separation in all systems, indicating that charge transfer predominantly occurs from the bridge to the acceptor.