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Defect passivation with novel silicone copolymers for efficient perovskite light-emitting diodes.
- Source :
- Journal of Physics D: Applied Physics; 2/4/2021, Vol. 54 Issue 5-7, p1-7, 7p
- Publication Year :
- 2021
-
Abstract
- Pinhole-free perovskite films with low defect density are essential to boost the efficiency of metal halide perovskite light-emitting diodes (PeLEDs). In this work, a novel amphiphilic silicone copolymer (Si<subscript>14</subscript>-PEG<subscript>14</subscript>-QAC) is introduced into perovskite as a passivation agent to improve the performance of PeLEDs. Si<subscript>14</subscript>-PEG<subscript>14</subscript>-QAC possesses polyethylene glycol and –NCH<subscript>3</subscript> units, which can interact with perovskite by hydrogen bonding, resulting in high-quality perovskite films with small-size crystals, high coverage, low defect density, and enhanced photoluminescence quantum yield. Consequently, the perovskite films with Si<subscript>14</subscript>-PEG<subscript>14</subscript>-QAC enable efficient green PeLEDs with an external quantum efficiency of 4.5%, which is much higher than that of the control device without the polymer passivator (0.86%). This work suggests the great potential of silicone copolymers as passivation agents for high-quality perovskite films with high performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00223727
- Volume :
- 54
- Issue :
- 5-7
- Database :
- Complementary Index
- Journal :
- Journal of Physics D: Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 147616908
- Full Text :
- https://doi.org/10.1088/1361-6463/abc4a9