am7b05146_si_001.pdf (1.59 MB)
Silicotungstate, a Potential Electron Transporting Layer for Low-Temperature Perovskite Solar Cells
journal contribution
posted on 2017-07-12, 00:00 authored by Yoon Ho Choi, Hyun Bin Kim, In Seok Yang, Sang Do Sung, Young Sik Choi, Jeongho Kim, Wan In LeeThin
films of a heteropolytungstate, lithium silicotungstate (Li4SiW12O40, termed Li-ST), prepared by a solution
process at low temperature, were successfully applied as electron
transporting layer (ETL) of planar-type perovskite solar cells (PSCs).
Dense and uniform Li-ST films were prepared on FTO glass by depositing
a thin Li-ST buffer layer, followed by coating of a main Li-ST layer.
The film thickness was controlled by varying the number of coating
cycles, consisting of spin-coating and thermal treatment at 150 °C.
In particular, by employing 60 nm-thick Li-ST layer obtained by two
cycles of coating, the fabricated CH3NH3PbI3 PSC device demonstrates the photovoltaic conversion efficiency
(PCE) of 14.26% with JSC of 22.16 mA cm–2, VOC of 0.993 mV and
FF of 64.81%. The obtained PCE is significantly higher than that of
the PSC employing a TiO2 layer processed at the same temperature
(PCE = 12.27%). Spectroscopic analyses by time-resolved photoluminescence
and pulsed light-induced transient measurement of photocurrent indicate
that the Li-ST layer collects electrons from CH3NH3PbI3 more efficiently and also exhibits longer
electron lifetime than the TiO2 layer thermally treated
at 150 °C. Thus, Li-ST is considered to be a promising ETL material
that can be applied for the fabrication of flexible PSC devices.
History
Usage metrics
Categories
- Biophysics
- Biochemistry
- Space Science
- Physical Sciences not elsewhere classified
- Microbiology
- Cell Biology
- Biotechnology
- Environmental Sciences not elsewhere classified
- Chemical Sciences not elsewhere classified
- Ecology
- Biological Sciences not elsewhere classified
- Developmental Biology
- Cancer
- Inorganic Chemistry
- Infectious Diseases
- Plant Biology
Keywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC