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A sulfur-rich small molecule as a bifunctional interfacial layer for stable perovskite solar cells with efficiencies exceeding 22%
- Source :
- Nano Energy. 79:105462
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Remarkable progress has been made in perovskite solar cells (PSCs) recently. However, the defects present in the perovskite layer act as non-radiative recombination centers to decrease the stability and restrict the further performance improvement of the device. We report herein a sulfur-rich two-dimensional small molecule, SMe-TATPyr, as a bifunctional layer to efficiently passivate the surface defects of perovskite and facilitate the hole transfer at the perovskite/spiro-OMeTAD interface. X-ray photoelectron spectroscopy analyses show that the sulfur atoms of SMe-TATPyr can passivate the uncoordinated Pb2+ defects and suppress the Pb0 defect formation as Lewis bases. As a result, the power conversion efficiency of PSCs is distinctly increased from 20.4% to 22.3%. Moreover, this simple interfacial modification could effectively enhance the stability of unencapsulated PSCs to retain 95% of the initial efficiency after storage for 1500 h at ambient conditions, in contrast to 70% efficiency retention of the device without SMe-TATPyr under the same conditions.
- Subjects :
- Materials science
Passivation
Renewable Energy, Sustainability and the Environment
Energy conversion efficiency
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Sulfur
0104 chemical sciences
chemistry.chemical_compound
X-ray photoelectron spectroscopy
Chemical engineering
chemistry
General Materials Science
Lewis acids and bases
Electrical and Electronic Engineering
0210 nano-technology
Bifunctional
Layer (electronics)
Perovskite (structure)
Subjects
Details
- ISSN :
- 22112855
- Volume :
- 79
- Database :
- OpenAIRE
- Journal :
- Nano Energy
- Accession number :
- edsair.doi...........545a925639719aa99b23987304f68b25