氯化铯掺杂PEDOT:PSS助力高效率、高亮度钙钛矿发光二极管

黎明亮; 林克斌; 卢建勋; 冯文静; 马青山; 张文华; 魏展画

doi:10.37188/CJLCD.2020-0272

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氯化铯掺杂PEDOT:PSS助力高效率、高亮度钙钛矿发光二极管

钙钛矿发光显示材料与器件 | 更新时间：2021-02-01

- 氯化铯掺杂PEDOT:PSS助力高效率、高亮度钙钛矿发光二极管
- PEDOT: PSS doped with cesium chloride for highly efficient and bright metal halide perovskite light-emitting diodes
- 液晶与显示 2021年36卷第1期页码：141-148
- 作者机构：
  
  1.中国工程物理研究院化工材料研究所四川新材料中心, 四川成都 610200
  2.华侨大学材料科学与工程学院发光材料与信息显示研究院, 福建厦门 361021
- 作者简介：
  
  [ "黎明亮(1995-), 男, 四川遂宁人, 博士研究生, 2018年于四川大学获得学士学位, 主要从事钙钛矿发光材料与器件方面的研究。E-mail:1187708324@qq.com" ]
  [ "张文华(1970-), 男, 山东临淄人, 博士, 研究员, 2000年于中国科学院上海硅酸盐研究所获得博士学位, 主要从事钙钛矿太阳能电池、辐照探测及新型储能电池等方面的研究。E-mail:whzhang@caep.cn" ]
  [ "魏展画(1989-), 男, 福建三明人, 博士, 教授, 2015年于香港科技大学获得博士学位, 主要从事能源光电材料与器件、钙钛矿电致发光器件和钙钛矿太阳能电池方面的研究。E-mail:weizhanhua@hqu.edu.cn" ]
- 基金信息：
  
  四川省自然科学基金委项目(2020Yj0193);国家自然科学基金(51802102);国家自然科学基金(21805101);国家自然科学基金(51902110)
- DOI：10.37188/CJLCD.2020-0272
  中图分类号： TN383.1
- 收稿日期：2020-10-10，
  
  录用日期：2020-11-11，
  
  纸质出版日期：2021-01
- 稿件说明：
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黎明亮, 林克斌, 卢建勋, 等. 氯化铯掺杂PEDOT:PSS助力高效率、高亮度钙钛矿发光二极管[J]. 液晶与显示, 2021,36(1):141-148.

Ming-liang LI, Ke-bin LIN, Jian-xun LU, et al. PEDOT: PSS doped with cesium chloride for highly efficient and bright metal halide perovskite light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 141-148.
黎明亮, 林克斌, 卢建勋, 等. 氯化铯掺杂PEDOT:PSS助力高效率、高亮度钙钛矿发光二极管[J]. 液晶与显示, 2021,36(1):141-148. DOI： 10.37188/CJLCD.2020-0272.

Ming-liang LI, Ke-bin LIN, Jian-xun LU, et al. PEDOT: PSS doped with cesium chloride for highly efficient and bright metal halide perovskite light-emitting diodes[J]. Chinese journal of liquid crystals and displays, 2021, 36(1): 141-148. DOI： 10.37188/CJLCD.2020-0272.

摘要

空穴传输层（Hole Transport Layer，HTL）是金属卤化物钙钛矿发光二极管（Perovskite Light-emitting Diodes，Pero-LEDs）中影响载流子传输平衡的一个重要因素。聚（3，4-乙烯基二氧噻吩）：聚苯乙烯磺酸钠（Poly（3，4-ethylenedioxythiophene）：Poly（styrene sulfonate），PEDOT：PSS）薄膜因其优异的导电性能、光透过率以及简单的溶液制膜工艺，而广泛应用于Pero-LEDs的HTL。然而，钙钛矿发光层的价带与PEDOT：PSS薄膜最高占据分子轨道（Highest Occupied Molecular Orbital，HOMO）能级之间能带差较大，增大了空穴注入势垒，继而降低了器件效率。本文通过向PEDOT：PSS水溶液掺入适量的氯化铯（CsCl）添加剂，有效调控了PEDOT：PSS薄膜的HOMO能级，使其与钙钛矿发光层更加匹配；同时CsCl掺杂也提高了PEDOT：PSS薄膜的空穴传输能力，使载流子传输更趋于平衡。基于改性的PEDOT：PSS薄膜，最佳器件达到了124 012 cd/m

的高亮度，其最大外量子效率（External Quantum Efficiency，EQE）达到了10.39%；相对于未掺杂的样品，最大亮度增加了25.49%，最大EQE增加了63.88%。

Abstract

Hole Transport Layer (HTL) is an important factor affecting carrier transport balance in metal halide Perovskite Light-emitting Diodes (Pero-LEDs). Poly(3

4-ethylenedioxythiophene):Poly (styrene sulfonate) (PEDOT:PSS) films are widely used as the HTL of Pero-LEDs due to their excellent conductive properties

light transmittance and simple solution preparation. However

the gap between the valence band of perovskite and the highest occupied molecular orbital (HOMO) energy level of PEDOT:PSS film is large

which increases the hole injection barrier and thus reduces the device efficiency. Herein

a simple method of directly adding cesium chloride (CsCl) into PEDOT:PSS aqueous solution improved the hole transport capacity of PEDOT:PSS film significantly

making the carrier transport more balanced. Based on the modified PEDOT:PSS film

the best device reaches high brightness of 124 012 cd/m

and the maximum external quantum efficiency (EQE) reaches 10.39%

respectively. Compared with the undoped samples

the maximum brightness increased by 25.49%

and the maximum EQE increased by 63.88%.

关键词

Keywords

references

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