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Updated: Feb 15, 2026

Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Infrared Solution-Processed Quantum Dot Solar Cells Reaching External Quantum Efficiency of 80% at 1.35 µm and Jsc in
Yu Bi1, Santanu Pradhan1, Shuchi Gupta1
1ICFO (Institut de Ciencies Fotoniques), The Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss, 3, 08860, Castelldefels (Barcelona), Spain.
Abstract:
Developing low-cost photovoltaic absorbers that can harvest the short-wave infrared (SWIR) part of the solar spectrum, which remains unharnessed by current Si-based and perovskite photovoltaic technologies, is a prerequisite for making high-efficiency, low-cost tandem solar cells. Here, infrared PbS colloidal quantum dot (CQD) solar cells employing a hybrid inorganic-organic ligand exchange process that results in an external quantum efficiency of 80% at 1.35 µm are reported, leading to a short-circuit current density of 34 mA cm-2 and a power conversion efficiency (PCE) up to 7.9%, which is a current record for SWIR CQD solar cells. When this cell is placed at the back of an MAPbI3 perovskite film, it delivers an extra 3.3% PCE by harnessing light beyond 750 nm.
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