Abstract
Solution-processed planar heterojunction colloidal quantum dot photovoltaics with a hybrid active bilayer is demonstrated. A power conversion efficiency of 1.24% under simulated air mass 1.5 illumination conditions is reported. This was achieved through solid-state treatment with cetyltrimethylammonium bromide of PbS colloidal quantum dot solid films. That treatment was used to passivate Br atomic ligands as well as to engineer the interface within the hybrid active bilayer.
Highlights
Much of the recent effort to develop photovoltaics (PV) has focused on third-generation PV
We introduce a planar heterojunction (PHJ) device architecture that has a ‘hybrid active bilayer,’ i.e., PbS Colloidal quantum dots (CQDs) solid films layered with a blend of P3HT and [6,6]-phenylC61-butyric acid methyl ester (PCBM)
The particle size and shape of our synthesized PbS CQDs were determined by high-resolution transmission electron microscopy (HRTEM) (Figure 1)
Summary
Much of the recent effort to develop photovoltaics (PV) has focused on third-generation PV. The third-generation PV is defined by cost and power conversion efficiency (PCE) greater than the Shockley-Queisser limit of 32% [1]. It can be reached through device architecture innovations, multiple-carrier generation using impact ionization, and new materials. CQD-based PV has lower cost per area and benefits from greater process flexibility compared with Si-based PV. Some issues must still be overcome for PV applications They are especially sensitive to humidity, light, and oxygen [6,7]. Concurrent use of CQDs and organic compounds in devices has been one approach; these materials have typically been blended together [8,9,10]. In one example of a bilayer approach, Spoerke et al reported that bilayer-based PV made with CdS CQDs and poly(3-hexylthiophene) (P3HT) had a PCE of 0.11% under simulated air mass (AM) 1.5 conditions [11]
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