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基于N型纳米晶硅氧电子注入层的钙钛矿发光二极管

黄伟 李跃龙 任慧志 王鹏阳 魏长春 侯国付 张德坤 许盛之 王广才 赵颖 袁明鉴 张晓丹

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基于N型纳米晶硅氧电子注入层的钙钛矿发光二极管

黄伟, 李跃龙, 任慧志, 王鹏阳, 魏长春, 侯国付, 张德坤, 许盛之, 王广才, 赵颖, 袁明鉴, 张晓丹

Perovskite light-emitting diodes based on n-type nanocrystalline silicon oxide electron injection layer

Huang Wei, Li Yue-Long, Ren Hui-Zhi, Wang Peng-Yang, Wei Chang-Chun, Hou Guo-Fu, Zhang De-Kun, Xu Sheng-Zhi, Wang Guang-Cai, Zhao Ying, Yuan Ming-Jian, Zhang Xiao-Dan
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  • 钙钛矿材料由于其禁带宽度可调、光致发光量子产率高、色纯高等优点, 使得其在发光器件上具有巨大的应用潜力. 电子注入材料是钙钛矿发光器件中的重要组成部分, 特别是n-i-p型发光器件, 其直接影响后面钙钛矿的生长情况. 本文通过向钙钛矿发光二极管中引入一种新型电子注入材料, n型纳米晶硅氧(n-nc-SiOx:H). 借助于n-nc-SiOx:H薄膜平滑的表面, 有效地提高了沉积钙钛矿薄膜的结晶质量, 同时其能带结构更加匹配, 有效地降低了电子的注入势垒. 为了进一步提升器件性能, 向钙钛矿材料中引入合适比例的甲基溴化胺(MABr)、氯苯反溶剂中引入一定量的苯甲胺(PMA), 通过MABr和PMA的协同作用提高了钙钛矿薄膜的覆盖率, 降低了钙钛矿薄膜表面的缺陷密度, 抑制了钙钛矿薄膜退火过程中的发光猝灭, 最终获得了最大电流效率为7.93 cd·A-1、最大外量子效率为2.13%的n-i-p型钙钛矿发光二极管.
    Organometal halide perovskites featuring solution-processable characteristics, high photoluminescence quantum yield (PLQY), and color purity, are an emerging class of semiconductor with considerable potential applications in optoelectronic devices. Electron injection layer is an important component of perovskite light-emitting device, which determines the growth of perovskite film directly. In this paper, the perovskite light-emitting diodes (PeLEDs) based on n-type nanocrystalline silicon oxide (n-nc-SiOx:H) electron injection layer are designed and realized. This novel electron injecting material is prepared by the plasma enhanced chemical vapor deposition (PECVD), and its smooth surface and matched energy band result in superior perovskite crystallinity and low electron injection barrier from the electron injecting layer to the emissive layer, respectively. However, the external quantum efficiency (EQE) of PeLED is as low as 0.43%, which relates to defects and leakage current due to the incomplete surface coverage of perovskite film. The fast exciton emission decay (< 10 ns) stems from strong non-radiative energy transfer to the trap states, and represents a big challenge in fabricating high-efficiency PeLEDs. In order to obtain desirable perovskite film morphology, an excessive proportion of methylammonium bromide (MABr) is incorporated into the perovskite solution, and a volume of benzylamine (PMA) is added into the chlorobenzene antisolvent. The perovskite films suffer low PLQY and short PL lifetime if only MABr or PMA is introduced. When the molar ratio of MABr is higher than 60%, the luminescence quenching arising from Joule heating is depressed by employing PMA, contributing to a higher PLQY (> 30%) and a longer carrier lifetime. The synergistic effect of MABr and PMA increase the coverage and reduce the trap density of perovskite film, inhibit the luminescence quenching in the annealing process, and thus facilitating the perovskite film with higher quality. Finally, the n-i-p PeLED exhibits green-light emission with a maximum current efficiency of 7.93 cd·A-1 and a maximum EQE up to 2.13% is obtained. These facts provide a novel electron injecting material and a feasible process for implementing the PeLEDs. With further optimizing the perovskite layer and device configuration, the performance of n-i-p type PeLEDs will be improved significantly on the basis of this electron injection material.
      通信作者: 袁明鉴, yuanmj@nankai.edu.cn ; 张晓丹, xdzhang@nankai.edu.cn
    • 基金项目: 国家重点研发计划(批准号: 2018YFB1500103)、国家自然科学基金(批准号: 61674084)、高等学校学科创新引智计划(111 计划)(批准号: B16027)、天津市科技计划项目(批准号: 18ZXJMTG00220)和中央高校基本科研业务费资助的课题.
      Corresponding author: Yuan Ming-Jian, yuanmj@nankai.edu.cn ; Zhang Xiao-Dan, xdzhang@nankai.edu.cn
    • Funds: Project supported by the National Key Research and Development Program of China (Grant No. 2018YFB1500103), the National Natural Science Foundation of China (Grant No. 61674084), the Overseas Expertise Introduction Project for Discipline Innovation of Higher Education of China (Grant No. B16027), Tianjin Science and Technology Project, China (Grant No. 18ZXJMTG00220), and the Fundamental Research Funds for the Central Universities, Nankai University, China (Grant Nos. 63191736, ZB19500204).
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  • 图 1  能级结构与器件结构 (a) PeLEDs器件各层材料的能级结构图; (b) PeLEDs器件结构图

    Fig. 1.  Energy-level diagram and device structure: (a) band alignment of each functional layer; (b) structure diagram of PeLEDs device.

    图 2  不同衬底对钙钛矿薄膜的影响 (a)不同衬底表面的原子力显微镜图; (b)不同衬底上生长的钙钛矿薄膜X射线衍射图; (c)不同衬底上生长的钙钛矿薄膜PL光谱图

    Fig. 2.  Influence of different substrates on perovskite films: (a) Atomic force microscopy images of different substrate surfaces; (b) X-ray diffraction patterns of perovskite films on different substrates; (c) photoluminescence spectra of perovskite films on different substrates.

    图 3  钙钛矿成膜工艺 (a)三种钙钛矿薄膜制备工艺及对应的原子力显微镜图和实物图; (b)三种工艺下钙钛矿薄膜表面的扫描电子显微镜图

    Fig. 3.  Synthesis of perovskite film: (a) Different fabrication processes of perovskite films and the corresponding atomic force microscopy images and photographs; (b) planar scanning electron microscopy images of the perovskite films based on different fabrication processes.

    图 4  钙钛矿薄膜的光学性能表征 (a)不同浓度的MABr下, 退火前后钙钛矿薄膜的PLQY变化; (b)钙钛矿薄膜的吸收度; (c)归一化的PL谱

    Fig. 4.  Optical characterization of perovskite films: (a) PLQY of perovskite films before and after annealing at different concentrations of MABr; (b) absorbance spectra of perovskite films; (c) normalized PL spectra of perovskite films.

    图 5  钙钛矿薄膜在n-nc-SiOx:H基底下的TRPL图 (a)不加PMA时, 不同MABr浓度下钙钛矿TRPL图; (b)加入PMA时, 不同MABr浓度下钙钛矿TRPL图

    Fig. 5.  TRPL spectra of perovskite films on n-nc-SiOx:H: (a) TRPL spectra of perovskite films at different MABr concentrations without PMA additive; (b) TRPL spectra of perovskite films at different MABr concentrations with PMA additive.

    图 6  PeLEDs的电致发光表现 (a)器件的电流密度、光强随电压的变化; (b)器件的EQE随电流密度的变化; (c)器件的EQE随电压的变化; (d)器件发光对应的CIE坐标

    Fig. 6.  Electroluminescence of PeLEDs: (a) Current density and luminance of the device as a function of voltage; (b) EQE of the device as a function of current density; (c) EQE of the device as a function of voltage; (d) the corresponding CIE coordinate.

    表 1  基于两种不同电子注入层的PeLEDs器件性能的比较

    Table 1.  Performance of PeLEDs based on different electron injection layers.

    电子注入层Lmax/cd·m–2CE/cd·A–1EQE/%
    n-nc-Si:H6500.40.1
    n-nc-SiOx:H21001.370.43
    下载: 导出CSV
  • [1]

    Kojima A, Teshima K, Shirai Y, Miyasaka T 2009 J. Am. Chem. Soc. 131 6050Google Scholar

    [2]

    Stranks S D, Eperon G E, Grancini G, Menelaou C, Alcocer M J, Leijtens T, Herz L M, Petrozza A, Snaith H J 2013 Science 342 341Google Scholar

    [3]

    Jeon N J, Noh J H, Yang W S, Kim Y C, Ryu S, Seo J, Seok S I 2015 Nature 517 476Google Scholar

    [4]

    Tan H, Jain A, Voznyy O, Lan X, DeArquer F P G, Fan J Z, Bermudez R Q, Yuan M, Zhang B, Zhao Y, Fan F, Li P, Quan L N, Zhao Y, Lu Z, Yang Z, Hoogland S, Sargent E H 2017 Science 355 722Google Scholar

    [5]

    姚鑫, 丁艳丽, 张晓丹, 赵颖 2015 物理学报 64 038805Google Scholar

    Yao X, Ding Y L, Zhang X D, Zhao Y 2015 Acta Phys. Sin. 64 038805Google Scholar

    [6]

    Protesescu L, Yakunin S, Bodnarchuk M I, Krieg F, Caputo R, Hendon C H, Yang R X, Walsh A, Kovalenko M V 2015 Nano Lett. 15 3692Google Scholar

    [7]

    Chondroudis K, Mitzi D B 1999 Chem. Mater. 11 3028Google Scholar

    [8]

    Tan Z K, Moghaddam R S, Lai M L, Docampo P, Higler R, Deschler F, Price M, Sadhanala A, Pazos L M, Credgington D, Hanusch F, Bein T, Snaith H J, Friend R H 2014 Nat. Nanotechnol. 9 687Google Scholar

    [9]

    Song J, Li J, Xu L, Li J, Zhang F, Han B, Shan Q, Zeng H 2018 Adv. Mater. 30 1800764Google Scholar

    [10]

    Xiao Z, Kerner R A, Zhao L, Tran N L, Lee K M, Koh T W, Scholes G D, Rand B P 2017 Nat. Photon. 11 108Google Scholar

    [11]

    Yang X, Zhang X, Deng J, Chu Z, Jiang Q, Meng J, Wang P, Zhang L, Yin Z, You J 2018 Nat. Commun. 9 570Google Scholar

    [12]

    Lu M, Zhang X, Bai X, Wu H, Shen X, Zhang Y, Zhang W, Zheng W, Song H, Yu W W, Rogach A L 2018 ACS Energy Lett. 3 1571Google Scholar

    [13]

    Chiba T, Hoshi K, Pu Y J, Takeda Y, Hayashi Y, Ohisa S, Kawata S, Kido J 2017 ACS Appl. Mater. Interfaces 9 18054Google Scholar

    [14]

    Lee J W, Choi Y J, Yang J M, Ham S, Jeon S K, Lee J Y, Song Y H, Ji E K, Yoon D H, Seo S, Shin H, Han G S, Jung H S, Kim D, Park N G 2017 ACS Nano 11 3311Google Scholar

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    [17]

    Zhou Y, Fuentes-Hernandez C, Shim J, Meyer J, Giordano A J, Li H, Winget P, Papadopoulos T, Cheun H, Kim J, Fenoll M, Dindar A, Haske W, Najafabadi E, Khan T M, Sojoudi H, Barlow S, Graham S, Bredas J L, Marder S R, Kahn A, Kippelen B 2012 Science 336 327Google Scholar

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    [21]

    Chiba T, Hayashi Y, Ebe H, Hoshi K, Sato J, Sato S, Pu Y J, Ohisa S, Kido J 2018 Nat. Photon. 12 681Google Scholar

    [22]

    Saliba M, Matsui T, Domanski K, Seo J Y, Ummadisingu A, Zakeeruddin S M, Correa-Baena J P, Tress W R, Abate A, Hagfeldt A, Grätzel M 2016 Science 354 206Google Scholar

    [23]

    Zou Y, Ban M, Yang Y, Bai S, Wu C, Han Y, Wu T, Tan Y, Huang Q, Gao X, Song T, Zhang Q, Sun B 2018 ACS Appl. Mater. Interfaces 10 24320Google Scholar

    [24]

    丁雄傑, 倪露, 马圣博, 马英壮, 肖立新, 陈志坚 2015 物理学报 64 038802Google Scholar

    Ding X J, Ni L, Ma S B, Ma Y Z, Xiao L X, Chen Z J 2015 Acta Phys. Sin. 64 038802Google Scholar

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    Savenije T J, Huijser A, Vermeulen M J, Katoh R 2008 Chem. Phys. Lett. 461 93Google Scholar

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    [28]

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    Lee S, Park J H, Nam Y S, Lee B R, Zhao B, Nuzzo D D, Jung E D, Jeon H, Kim J Y, Jeong H Y, Friend R H, Song M H 2018 ACS Nano 12 3417Google Scholar

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    Zhao L, Lee K M, Roh K, Khan S U Z, Rand B P 2019 Adv. Mater. 31 1805836

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    Shi H, Du M H 2014 Phys. Rev. B 90 174103Google Scholar

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    Lin K, Xing J, Quan L N, de Arquer F P G, Gong X, Lu J, Xie L, Zhao W, Zhang D, Yan C, Li W, Liu X, Lu Y, Kirman J, Sargent E H, Xiong Q, Wei Z 2018 Nature 562 245Google Scholar

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出版历程
  • 收稿日期:  2019-02-26
  • 修回日期:  2019-04-08
  • 上网日期:  2019-06-06
  • 刊出日期:  2019-06-20

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