A hole injection monolayer enables cost-effective perovskite light-emitting diodes
A hole injection monolayer enables cost-effective perovskite light-emitting diodes
复制标题
空穴注入单层可实现经济高效的钙钛矿发光二极管
DOI：
10.1039/d2tc05491d
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发表时间：
2023
影响因子：
6.4
通讯作者：
Qi Yabing
中科院分区：
文献类型：
--
作者：
Zhang Congyang;Mariotti Silvia;Ono Luis K.;Ding Chenfeng;Mitrofanov Kirill;Zhang Caiyi;Yuan Shuai;Ji Penghui;Zhang Jiahao;Wu Tianhao;Kabe Ryota;Qi Yabing
开发具有成本效益的制造方法是金属卤化物钙钛矿发光二极管（PeLED）走向未来商业化和工业应用的关键步骤之一。考虑到低材料消耗，可升级的加工和表面锚定单层的能级偏移可调性，我们提出了一种[2-（9 H-咔唑-9-基）乙基]膦酸，2PACz为基础的空穴注入单层（HIML）的高效PeLED的成本效益的制造。在系统的表面科学研究和表征的基础上，我们阐明了2PACz分子层对ITO的功函数工程，ITO和钙钛矿发光层之间的能量对准和空穴注入，以及底部界面处钙钛矿层的辐射复合的影响。特别是，我们的厚度依赖的UPS测量结果表明，2PACz的分子偶极子是ITO的功函数变化的主要贡献者。最后，通过展示具有蓝光发射和扩大的器件面积的高效LED，我们验证了基于HIML的策略的通用性。这项研究强调了HIML在经济高效的PeLED方面的巨大潜力，这有助于将钙钛矿发光技术转化为未来的商业水平。
Developing cost-effective fabrication is one of the key steps for metal halide perovskite light emitting diodes (PeLEDs) toward their future commercialization and industrial applications. Considering the low material consumption, upscalable processing and energy level offset tunability of the surface anchored monolayer, we proposed a [2-(9H-carbazol-9-yl)ethyl]phosphonic acid, 2PACz-based hole injection monolayer (HIML) for the cost-effective fabrication of efficient PeLEDs. On the basis of the systematic surface science study and characterization, we elucidate the effect of the 2PACz molecular layer on the work function engineering of ITO, energetic alignment and hole injection between ITO and the perovskite emission layer, and the radiative recombination of the perovskite layer at the bottom interface. In particular, our thickness-dependent UPS measurement results suggest that the molecular dipole of 2PACz is the main contributor for the work function change of ITO. Finally, by demonstrating efficient LEDs with blue emission and enlarged device area, we verified the universality of the HIML-based strategy. This study highlights the great potential of the HIML for cost-effective PeLEDs, which can help translate perovskite light emission technologies toward the commercial level in the future.