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Efficient perovskite solar cells enabled by ion-modulated grain boundary passivation with a fill factor exceeding 84%
Jilin Univ, Peoples R China.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska fakulteten.
Jilin Univ, Peoples R China.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-2582-1740
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2019 (engelsk)Inngår i: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, nr 39, s. 22359-22365Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Alkali metal cation modulation toward high-electronic-quality perovskite films requires strict control over trap densities in the devices. By introducing tailor-made potassium cation (K+)-functionalized carbon nanodots (CNDs@K) into the perovskite precursor solution, we succeeded in defect passivation and crystallization control of the perovskite film. X-ray diffraction indicated that the binding effect of carbon dots confined the K+ ions in the grain boundary and prevented excessive cations from occupying interstitial sites, thereby reducing the microstrain of the polycrystalline film. Consequently, the synergistic effect of the tailored crystal size and suppressed grain boundary defects could reduce the charge trap density, facilitate charge generation, and lengthen the carrier lifetime, leading to a boosted efficiency of 21.01% with a high fill factor of 84%. This performance is among the best reported for carbon dot-doped PSCs.

sted, utgiver, år, opplag, sider
ROYAL SOC CHEMISTRY , 2019. Vol. 7, nr 39, s. 22359-22365
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URN: urn:nbn:se:liu:diva-161380DOI: 10.1039/c9ta08081cISI: 000489727600018OAI: oai:DiVA.org:liu-161380DiVA, id: diva2:1367510
Merknad

Funding Agencies|National Natural Science Foundation of ChinaNational Natural Science Foundation of China [61875072]; Special Project of the Province-University Co-constructing Program of Jilin Province [SXGJXX2017-3]; International Cooperation and Exchange Project of Jilin Province [20170414002GH, 20180414001GH]

Tilgjengelig fra: 2019-11-04 Laget: 2019-11-04 Sist oppdatert: 2019-11-04

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