https://scholars.lib.ntu.edu.tw/handle/123456789/598123
Title: | Improving the performance of all-inorganic perovskite light-emitting diodes through using polymeric interlayers with a pendant design | Authors: | Chen, C.-H. Lin, Y.-C. Yang, Y.-F. Chiang, Y.-C. Li, Z. Yip, H.-L. WEN-CHANG CHEN CHU-CHEN CHUEH |
Keywords: | Conducting polymers;Conjugated polymers;Lead compounds;Organic light emitting diodes (OLED);organic-inorganic materials;Perovskite;Quantum efficiency;Ambient stability;Control device;Device performance;Inorganics;Lightemitting diode;Operational stability;Pendant groups;Performance;Photoluminescence quantum yields;Polymeric interlayers;Bromine compounds | Issue Date: | 2021 | Journal Volume: | 5 | Journal Issue: | 19 | Start page/Pages: | 7199-7207 | Source: | Materials Chemistry Frontiers | Abstract: | Despite demonstrating higher photoluminescence quantum yield and better ambient and operational stability than organic-inorganic hybrid perovskites, all-inorganic perovskites encounter the problem of inferior film quality and interfacial electrical properties, which limits the resultant device performance. In this study, three polymers, P4a-c, bearing distinct pendant groups based on a similar conjugated group are synthesized and employed as an interlayer to modify the PEDOT:PSS/CsPbBr3 interface. Due to the pendant design, P4a-c possess deep-lying HOMO levels and high transparency across the visible range. The different structures of the pendant groups in P4a-c are shown to result in their different propensity in energy-level modulation and solid-state aggregation, which plays a non-trivial role in affecting the resulting device performance. Due to the more appropriate energy levels and better regulation of CsPbBr3 crystals, P4c with a polar bridge moiety is shown to better mediate the performance of the derived device. The P4c-mediated PeLED delivers six times enhanced luminance (Lmax, ?36?000 cd m-2) and 3.6 times enhanced external quantum efficiency (EQE, 2.16%) as compared to the control device (?6000 cd m-2, 0.60%). Notably, all the devices using P4a-c interlayers deliver a lower turn-on voltage than the control device, clearly revealing the positive role of P4a-c interlayers on diminishing the barrier across the associated interface to improve charge injection efficiency. This journal is ? the Partner Organisations. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116346260&doi=10.1039%2fd1qm01027a&partnerID=40&md5=144c6526933310788d3180bf6183f825 https://scholars.lib.ntu.edu.tw/handle/123456789/598123 |
ISSN: | 20521537 | DOI: | 10.1039/d1qm01027a |
Appears in Collections: | 化學工程學系 |
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