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SnSe 2 Quantum Dots and Chlorhexidine Acetate Suppress Synergistically Non-radiative Recombination Loss for High Efficiency and Stability Perovskite Solar Cells.
- Source :
-
Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Sep; Vol. 20 (38), pp. e2402385. Date of Electronic Publication: 2024 May 14. - Publication Year :
- 2024
-
Abstract
- Non-radiative recombination losses limit the property of perovskite solar cells (PSCs). Here, a synergistic strategy of SnSe <subscript>2</subscript> QDs doping into SnO <subscript>2</subscript> and chlorhexidine acetate (CA) coating on the surface of perovskite is proposed. The introduction of 2D SnSe <subscript>2</subscript> QDs reduces the oxygen vacancy defects and increases the carrier mobility of SnO <subscript>2</subscript> . The optimized SnO <subscript>2</subscript> as a buried interface obviously improves the crystallization quality of perovskite. The CA containing abundant active sites of ─NH <subscript>2</subscript> /─NH─, ─C═N, CO, ─Cl groups passivate the defects on the surface and grain boundary of perovskite. The alkyl chain of CA also improves the hydrophobicity of perovskite. Moreover, the synergism of SnSe <subscript>2</subscript> QDs and CA releases the residual stress and regulates the energy level arrangement at the top and bottom interface of perovskite. Benefiting from these advantages, the bulk and interface non-radiative recombination loss is greatly suppressed and thereby increases the carrier transport and extraction in devices. As a result, the best power conversion efficiency (PCE) of 23.41% for rigid PSCs and the best PCE of 21.84% for flexible PSCs are reached. The rigid PSC maintains 89% of initial efficiency after storing nitrogen for 3100 h. The flexible PSCs retain 87% of the initial PCE after 5000 bending cycles at a bending radius of 5 mm.<br /> (© 2024 Wiley‐VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1613-6829
- Volume :
- 20
- Issue :
- 38
- Database :
- MEDLINE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 38742952
- Full Text :
- https://doi.org/10.1002/smll.202402385