Bis(stearoyl) Sulfide: A Stable, Odor-Free Sulfur Precursor for High-Efficiency Metal Sulfide Quantum Dot Photovoltaics

摘要

The synthesis of metal sulfide nanocrystals is a crucial step in the fabricationof quantum dot (QD) photovoltaics. Control over the QD size during synthesisallows for precise tuning of their optical and electronic properties, making theman appealing choice for electronic applications. This flexibility has led to theimplementation of QDs in both highly-efficient single junction solar cells andother optoelectronic devices including photodetectors and transistors. Mostcommonly, metal sulfide QDs are synthesized using the hot-injection methodutilizing a toxic, and air- and moisture-sensitive sulfur source: bis(trimethylsilyl)sulfide ((TMS)_2S). Here, bis(stearoyl) sulfide (St_2S) is presented as a new type ofair-stable sulfur precursor for the synthesis of sulfide-based QDs, which yieldsuniform, pure, and stable nanocrystals. Photovoltaic devices based on theseQDs are equally efficient as those fabricated by (TMS)_2S but exhibit enhancedoperational stability. These results highlight that St_2S can be widely adopted forthe synthesis of metal sulfide QDs for a range of optoelectronic applications.