材料科学
钙钛矿(结构)
光电子学
量子点
二极管
发光二极管
载流子密度
多激子产生
纳米技术
化学工程
兴奋剂
工程类
作者
Yuqin Su,Hengyang Xiang,Ya‐Kun Wang,Huifeng Li,Yifei Wang,Xinyi Lv,Min Xie,Shengli Zhang,Zhiyong Fan,Jianyu Yuan,Liang‐Sheng Liao,Haibo Zeng
标识
DOI:10.1002/adma.202506397
摘要
Perovskite quantum dots (PQDs) are promising for both solar cells (SCs) and light emitting diodes (LEDs) for their excellent optoelectronic characteristics and solution-processable fabrication. One of the general limitations for these two kinds of devices is that high defect density and poor charge transport, resulting from the unavoidable amidation-induced PbX2 precipitation at high reaction temperature. In this work, an amidation-retarded synthesis strategy is proposed to prevent the PbX2 precipitation and subsequent defect formation. Covalent metal halides are introduced to interrupt amidation by reacting with deprotonated oleic acid/protonated oleylamine. Then, free acids/amines are released to coordinate with PbX2 and form regular lead-halide octahedra during nucleation-growth process. The synthesized CsPbI3 PQDs exhibit lower defect density (5.1 × 1017 cm-3), higher PLQY (92%) and better charge output capacity (≈8 times improvement). As a result, the LEDs and SCs achieve a maximum external quantum efficiency of 28.71% and power conversion efficiency of 16.20%, respectively, representing the state-of-the-art performance. Furthermore, the universality of such strategy has been demonstrated in red/green/blue LEDs, and could be expected in other optoelectronic devices.
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