Performance Improvement in Low-Temperature-Processed Perovskite Solar Cells by Molecular Engineering of Porphyrin-Based Hole Transport Materials

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Title
Performance Improvement in Low-Temperature-Processed Perovskite Solar Cells by Molecular Engineering of Porphyrin-Based Hole Transport Materials
Author
Azmi, RandiLee, Un-HakWibowo, Febrian Tri AdhiEom, Seung HunYoon, Sung CheolJang, Sung-YeonJung, In Hwan
Issue Date
2018-10
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.10, no.41, pp.35404 - 35410
Abstract
Porphyrin derivatives have recently emerged as hole transport layers (HTLs) because of their electron-rich characteristics. Although several successes with porphyrin-based HTLs have been recently reported, achieving excellent solar cell performance, the chances to improve this further by molecular engineering are still open. In this work, Zn porphyrin (P-zn)-based HTLs were developed by conjugating fluorinated triphenylamine (FTPA) wings at the perimeter of the P-zn core for low-temperature perovskite solar cells (L-PSCs). The fluorinated P-zn-HTLs (P-zn-2FTPA and P-zn-3FTPA) exhibited superior HTL properties compared to the nonfluorinated one (P-zn-TPA). Moreover, their deeper highest occupied molecular orbital energy levels were beneficial for boosting open-circuit voltages, and their enhanced face-on stacking improved the hole transport properties. The L-PSC using P-zn-2FTPA achieved the highest performance of 18.85%. Thus far, this result is one of the highest reported power conversion efficiencies among the PSCs using porphyrin-based HTLs.
URI
https://scholarworks.unist.ac.kr/handle/201301/26758
URL
https://pubs.acs.org/doi/10.1021/acsami.8b10170
DOI
10.1021/acsami.8b10170
ISSN
1944-8244
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