Pushing up the efficiency of planar perovskite solar cells to 18.2% with organic small molecules as the electron transport layer

Pei Yang Gu, Ning Wang, Chengyuan Wang, Yecheng Zhou, Guankui Long, Miaomiao Tian, Wangqiao Chen, Xiao Wei Sun, Mercouri G Kanatzidis, Qichun Zhang

Research output: Contribution to journalArticle

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Abstract

Compared to the traditional-architecture perovskite photovoltaic solar cells (n-i-p type), which use metal oxide as electron transport layers (ETLs) and organic semiconducting materials as hole transport layers, the fabrication of metal-oxide-free, solution-processed inverted perovskite solar cells (PSCs) is more desired because of low-temperatures and all-solution-based applications in future commercial PSC modules. In a typical configuration of inverted PSCs, the widely used ETL compound is the fullerene-based phenyl-C61-butyric acid methyl ester (PCBM), which currently is the best organic ETL material. The cost of this compound is very high, and the morphology and electrical properties are very sensitive to experimental conditions. We here propose a new organic ETL material for the replacement of PCBM in inverted PSCs. We demonstrate metal-oxide-free solution-processed inverted PSCs using the n-type sulfur-containing azaacene 10,14-bis(5-(2-ethylhexyl)thiophen-2-yl)-dipyrido[3,2-a:2′,3′-c][1,2,5]thiadiazolo[3,4-i]phenazine (TDTP) as the ETL with a power conversion efficiency of ∼18.2%, which is higher than that of the corresponding non-sulfur-containing azaacene 10,17-bis((triisopropylsilyl)ethynyl)dipyrido[3,2-a:2′,3′-c]quinoxalino[2,3-i]phenazine (PYPH)-based PSCs (up to 9.5%) or PCBM-based PSCs (up to 17.0%). This superior performance is attributed to the stronger interaction between TDTP and the perovskite surface than that between PYPH and the perovskite surface, which is supported by theoretical calculations. Our results show that easily-accessible simple n-type sulfur-containing small molecules are promising ETL candidates to further propel inverted PSCs to practical applications.

Original languageEnglish
Pages (from-to)7339-7344
Number of pages6
JournalJournal of Materials Chemistry A
Volume5
Issue number16
DOIs
Publication statusPublished - 2017

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Molecules
Butyric acid
Butyric Acid
Perovskite
Oxides
Esters
Metals
Sulfur
Fullerenes
Perovskite solar cells
Electron Transport
Conversion efficiency
Solar cells
Electric properties
Fabrication
perovskite
Costs
Temperature
phenazine

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Pushing up the efficiency of planar perovskite solar cells to 18.2% with organic small molecules as the electron transport layer. / Gu, Pei Yang; Wang, Ning; Wang, Chengyuan; Zhou, Yecheng; Long, Guankui; Tian, Miaomiao; Chen, Wangqiao; Sun, Xiao Wei; Kanatzidis, Mercouri G; Zhang, Qichun.

In: Journal of Materials Chemistry A, Vol. 5, No. 16, 2017, p. 7339-7344.

Research output: Contribution to journalArticle

Gu, Pei Yang ; Wang, Ning ; Wang, Chengyuan ; Zhou, Yecheng ; Long, Guankui ; Tian, Miaomiao ; Chen, Wangqiao ; Sun, Xiao Wei ; Kanatzidis, Mercouri G ; Zhang, Qichun. / Pushing up the efficiency of planar perovskite solar cells to 18.2% with organic small molecules as the electron transport layer. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 16. pp. 7339-7344.
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AU - Long, Guankui

AU - Tian, Miaomiao

AU - Chen, Wangqiao

AU - Sun, Xiao Wei

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