Lead sulphide (PbS) nanocrystals (NCs) are promising materials for low-cost, high performance optoelectronic devices. So far, PbS NCs have to be first synthesized with long-alkyl chain organic surface ligands and then be ligand-exchanged with shorter ligands (two-steps) to enable charge transport. However, the initial synthesis of insulated PbS NCs show no necessity and the ligand-exchange process is tedious and extravagant.
Recently, Prof. Wanli Ma group from FUNSOM developed a direct one-step, scalable synthetic method for iodide capped PbS (PbS-I) NC inks. The estimated cost for PbS-I NC inks is decreased to less than 6 $·g−1, compared with 16 $·g−1 for conventional methods. Furthermore, based on these PbS-I NCs, photodetector devices show a high detectivity of 1.4 × 1011 Jones and solar cells show an air-stable power conversion efficiency (PCE) up to 10%. This scalable and low-cost direct preparation of high-quality PbS-I NC inks may pave a path for the future commercialization of NC based optoelectronics. Their work has been published in Nature Communications (Nat. Commun. 2019,10, 5136), titled as “Room-Temperature Direct Synthesis of Semi-Conductive PbS Nanocrystal Inks for Optoelectronic Applications”.
Link to Prof. Ma’ group：http://funsom.suda.edu.cn/7f/97/c2735a32663/page.htm
Editor: Wenchang Zhu