Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

Yongjie Wang, Zeke Liu, Nengjie Huo, Fei Li, Mengfan Gu, Xufeng Ling, Yannan Zhang, Kunyuan Lu, Lu Han, Honghua Fang, Artem G. Shulga, Ye Xue, Sijie Zhou, Fan Yang, Xun Tang, Jiawei Zheng, Maria Antonietta Loi, Gerasimos Konstantatos, Wanli Ma*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

60 Citations (Scopus)
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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. Herein, we have 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, photo-detector devices show a high detectivity of 1.4 x 10(11) 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.

Original languageEnglish
Article number5136
Number of pages8
JournalNature Communications
Publication statusPublished - 13-Nov-2019



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