Harvesting Energy from Human Body Heat
This article describes a device for harvesting infrared energy from human body thermal radiation into electrical energy. The device takes advantage of quantum dots made of lead sulfide and couples multiple electronic excitations between mid-gap states to span the optical bandgap.
Applied Energy 230 (2018) 761–768
"Lead sulfide colloidal quantum dot photovoltaic cell for energy harvesting from human
body thermal radiation"
Taher Ghomiana, Orhan Kizilkaya, Jin-Woo Choi
Abstract:
In this paper, we present the development of a solution-processed photovoltaic structure
designed to convert human body thermal radiation into electricity. An active layer
composed of a layer of isopropylamine-capped lead sulfide (PbS) quantum dots (QDs)
covered with a layer of lithium chloride (LiCl) on top is sandwiched between a substrate
and an aluminum contact. Experimental measurements reveal that the device was sensitive to
infrared radiation with energies lower than the optical bandgap energy of the incorporated
nanocrystals (Eg=1.26 eV), allowing one to harvest thermal radiation from a human
body. We used a conceptually different approach to harvest this radiation by intentionally
introducing mid-gap states to the lead sulfide quantum dots through passivation with
isopropylamine and likely enabling a multi-step photon absorption mechanism.