以碱金属盐为阴极界面层的有机光电器件的制备及性能

doi:10.7503/cjcu20140662

高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (2): 349.doi: 10.7503/cjcu20140662

以碱金属盐为阴极界面层的有机光电器件的制备及性能

孙书恒, 吴英, 周威龙, 陈友春, 李枫红()

吉林大学超分子结构与材料国家重点实验, 长春 130012

收稿日期:2014-07-16 出版日期:2015-02-10 发布日期:2015-02-10
作者简介:联系人简介: 李枫红, 女, 博士, 副教授, 主要从事有机太阳能电池研究. E-mail: fhli@jlu.edu.cn
基金资助:
国家自然科学基金(批准号: 51273077)资助

Fabrication and Performance of Organic Optoelectronic Devices with Alkali Metal Salts as a Cathode Interlayer^†

SUN Shuheng, WU Ying, ZHOU Weilong, CHEN Youchun, LI Fenghong^*()

State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China

Received:2014-07-16 Online:2015-02-10 Published:2015-02-10
Contact: LI Fenghong E-mail:fhli@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.51273077)

摘要/Abstract

摘要：

以碱金属盐LiF, NaF, CsF和Cs₂CO₃作为阴极界面材料, 制备了高效率有机小分子电致发光二极管(SMOLEDs)、聚合物电致发光二极管(PLEDs)及聚合物太阳能电池(PSCs). 在SMOLEDs和PLEDs中, CsF作为阴极界面层的器件流明效率和功率效率最高. 在以聚对苯乙烯撑(P-PPV)为发光层的PLEDs中, CsF作为阴极界面层的器件最大流明效率可达17.85 cd/A, 比LiF作为阴极界面层的器件流明效率提高近300%. 在以聚(3-己基噻吩)(P3HT)∶[6,6]-苯基-C₆₁-丁酸甲酯(PC₆₁BM)为活性层的PSCs中, 当LiF为阴极界面层时, 器件功率转换效率(PCE)可达4.12%. 而以NaF, Cs₂CO₃和CsF为阴极界面层时, PCE分别为3.72%, 3.55%和3.2%. 这是因为从上述碱金属盐中分解出来的碱金属原子扩散进入器件的有机层并对有机层进行了n型掺杂, 影响了器件的电流密度和效率.

关键词: 有机小分子电致发光二极管, 聚合物电致发光二极管, 聚合物太阳能电池, 阴极界面层, 碱金属盐, 功率转换效率

Abstract:

Highly efficient organic small molecular light-emitting diodes(SMOLEDs), polymer light-emitting diodes(PLEDs) and polymer solar cells(PSCs) were fabricated using alkali metal salts(LiF, NaF, CsF and Cs₂CO₃) as a cathode interlayer. In SMOLEDs and PLEDs, introducing CsF as a cathode interlayer gives rise to the highest luminous efficiency and power efficiency in the four alkali metal salts. It is apparent that effect of LiF, NaF, CsF and Cs₂CO₃ as a cathode interlayer on device performance is different and modification ability sequence of the four alkali metal salts is CsF>Cs₂CO₃>NaF>LiF. When LiF is selected as a cathode interlayer in PSCs with poly(3-hexylthiophene)(P3HT)∶phenyl-C61-butyric acid methyl ester(P $C 6 0$ BM) as an active layer, power conversion efficiency(PCE) can reach 4.12% while PCE values of PSCs with NaF, Cs₂CO₃ and CsF as a cathode interlayer are 3.72%, 3.55% and 3.2%, respectively. We further found that the alkali metals atoms which decomposed from the alkali metal salts and diffused into organic layer may influence the efficiency and current density of the SMOLEDs, PLEDs and PSCs.

Key words: Organic small molecular light-emitting diode, Polymer light-emitting diode, Polymer solar cell, Cathode interlayer, Alkali metal salt, Power coversion efficiency

中图分类号:

O644.19
O63

TrendMD:

孙书恒, 吴英, 周威龙, 陈友春, 李枫红. 以碱金属盐为阴极界面层的有机光电器件的制备及性能. 高等学校化学学报, 2015, 36(2): 349.

SUN Shuheng, WU Ying, ZHOU Weilong, CHEN Youchun, LI Fenghong. Fabrication and Performance of Organic Optoelectronic Devices with Alkali Metal Salts as a Cathode Interlayer^†. Chem. J. Chinese Universities, 2015, 36(2): 349.

图/表 7

Fig.1 Energy level diagrams of SMOLEDs(Devices 1—4, A), PLEDs(Devies 5—8, B) and PSCs(Devices a—d, C) AMS: LiF, NaF, CsF or Cs2CO3.

Fig.2 J-V characteristics of Devices 1(LiF, a), 2(NaF, b), 3(CsF, c) and 4(Cs2CO3, d)

Fig.3 J0.5-V characteristics of Devices Ⅰ(LiF, a), Ⅱ(NaF, b), Ⅲ(CsF, c) and Ⅳ(Cs2CO3, d)

Fig.4 LE-J(A) and PE-J(B) characteristics of Devices 1(LiF, a), 2(NaF, b), 3(CsF, c) and 4(Cs2CO3, d)

Fig.5 LE-J(A) and PE-J(B) characteristics of Devices 5(LiF, a), 6(NaF, b), 7(CsF, c) and 8(Cs2CO3, d)

Fig.6 J-V characteristics of Devices a(LiF, a), b(NaF, b), c(CsF, c) and d(Cs2CO3, d)

Table 1 Performances of the PSCs with different alkali metal salts(AMSs)

Device	AMS	PCE(%)	J/(mA·cm^-2)	V_oc/V	FF(%)	R_s/(Ω·cm²)	R_sh/(Ω·cm²)
a	LiF	4.19	10.11	0.655	63	11.10	1520
b	NaF	3.72	9.95	0.655	57	11.83	792
c	CsF	3.20	9.36	0.649	53	15.31	409
d	Cs₂CO₃	3.55	9.46	0.649	58	11.50	556

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以碱金属盐为阴极界面层的有机光电器件的制备及性能

Fabrication and Performance of Organic Optoelectronic Devices with Alkali Metal Salts as a Cathode Interlayer^†

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以碱金属盐为阴极界面层的有机光电器件的制备及性能

Fabrication and Performance of Organic Optoelectronic Devices with Alkali Metal Salts as a Cathode Interlayer†

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Fabrication and Performance of Organic Optoelectronic Devices with Alkali Metal Salts as a Cathode Interlayer^†