Highly efficient air-stable colloidal quantum dot solar cells by improved surface trap passivation

Title
Highly efficient air-stable colloidal quantum dot solar cells by improved surface trap passivation
Authors
김태욱이진원RandiAzmiSepty SinagaHavid AqomaGabsoek SeoTae Kyu AhnMinsuk ParkSang-Yong JuSeung-Hwan OhSung-Yeon Jang
Keywords
Colloidal quantum dot; Dual exchange; Surface trap; Air-stability
Issue Date
2017-09
Publisher
Nano energy
Citation
VOL 39-94
Abstract
While the power conversion efficiency (PCE) of colloidal quantum dot (CQD) solar cells can reach > 10%, the major obstacle for charge extraction and energy loss in such devices is the presence of surface trap sites within CQDs. In this work, highly trap-passivated PbS CQDs were developed using a novel iodide based ligand, 1-propyl-2,3-dimethylimidazolium iodide (PDMII). We examined the effects of PDMII on the surface quality of PbS-CQDs and compared them with TBAI, which is the best-selling iodide based ligand. By using PDMII, improved surface passivation with reduced sub-bandgap trap-states compared to TBAI was achieved. The reduced trap density resulted in enhanced charge extraction with diminished energy loss (0.447 eV) in the devices. Solar cell devices using our PDMII based CQDs displayed high PCE and air stability. The certified PCE of our PDMII based devices reached 10.89% and was maintained at 90% after 210 days of air storage.
URI
http://pubs.kist.re.kr/handle/201004/65911
ISSN
2211-2855
Appears in Collections:
KIST Publication > Article
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