SnS4(4-), SbS4(3-), and AsS3(3-) Metal Chalcogenide Surface Ligands: Couplings to Quantum Dots, Electron Transfers, and All-Inorganic Multilayered Quantum Dot Sensitized Solar Cells

Ho Jin; Sukyung Choi; Guichuan Xing; Jung-Hoon Lee; Yongju Kwon; Wee Kiang Chong; Tze Chien Sum; Hyun Myung Jang; Sungjee Kim

doi:10.1021/jacs.5b05787

SnS4(4-), SbS4(3-), and AsS3(3-) Metal Chalcogenide Surface Ligands: Couplings to Quantum Dots, Electron Transfers, and All-Inorganic Multilayered Quantum Dot Sensitized Solar Cells

J Am Chem Soc. 2015 Nov 4;137(43):13827-35. doi: 10.1021/jacs.5b05787. Epub 2015 Oct 26.

Authors

Ho Jin¹, Sukyung Choi¹, Guichuan Xing^{2

3

4}, Jung-Hoon Lee⁵, Yongju Kwon¹, Wee Kiang Chong², Tze Chien Sum^{2

3

4}, Hyun Myung Jang⁵, Sungjee Kim¹

Affiliations

¹ Department of Chemistry, Pohang University of Science and Technology , Pohang 790-784, South Korea.
² Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, Singapore 637371.
³ Energy Research Institute @NTU (ERI@N), Research Techno Plaza , X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553.
⁴ Singapore-Berkeley Research Initiative for Sustainable Energy , 1 Create Way, Singapore 138602.
⁵ Department of Material Science and Engineering and Division of Advanced Materials Science, Pohang University of Science and Technology , Pohang 790-784, South Korea.

PMID: 26460796
DOI: 10.1021/jacs.5b05787

Abstract

Three inorganic capping ligands (ICLs) for quantum dots (QDs), SnS4(4-), SbS4(3-) and AsS3(3-), were synthesized and the energy levels determined. Proximity between the ICL LUMO and QD conduction level governed the electronic couplings such as absorption shift upon ligand exchange, and electron transfer rate to TiO2. QD-sensitized solar cells were fabricated, using the ICL-QDs and also using QD multilayers layer-by-layer assembled by bridging coordinations, and studied as a function of the ICL ligand and the number of QD layers.