A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells※

doi:10.6023/A21120622

Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (5): 581-589.DOI: 10.6023/A21120622 Previous Articles Next Articles

Special Issue: 中国科学院青年创新促进会合辑

Article

表面双重后处理方法提升三元NiMgO半导体界面层及其有机太阳能电池的性能^※

何新蕊^a^,^b, 蔡丽娜^a^,^b, 陈汉生^b, 尹攀^b, 尹志刚^b^,^c^,^*(), 郑庆东^b^,^*()

a 福州大学化学学院福州 350108
b 中国科学院福建物质结构研究所结构化学国家重点实验室福州 350002
c 中国福建光电信息科学与技术创新实验室福州 350108

投稿日期:2021-12-31 发布日期:2022-05-31
通讯作者: 尹志刚, 郑庆东
作者简介:
^※庆祝中国科学院青年创新促进会十年华诞.
基金资助:
福建省杰出青年科学基金(2019J06023); 国家自然科学基金(52130306); 国家自然科学基金(52173241); 中国福建光电信息科学与技术创新实验室(闽都创新实验室)主任基金(2021ZR116)

A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells^※

Xinrui He^a^,^b, Lina Cai^a^,^b, Hansheng Chen^b, Pan Yin^b, Zhigang Yin^b^,^c(), Qingdong Zheng^b()

a College of Chemistry, Fuzhou University, Fuzhou 350108
b State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002
c Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108

Received:2021-12-31 Published:2022-05-31
Contact: Zhigang Yin, Qingdong Zheng
About author:
^※Dedicated to the 10th anniversary of the Youth Innovation Promotion Association, CAS.
Supported by:
Natural Science Foundation of Fujian Province for Distinguished Young Scholars(2019J06023); National Natural Science Foundation of China(52130306); National Natural Science Foundation of China(52173241); Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR116)

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Abstract

Organic solar cells (OSCs) are among the most promising photovoltaic technologies to solve energy and environmental problems. To achieve highly efficient OSCs, controlling over electrode interfacial layers is greatly important for improving charge transportation and collection. Here, ternary metal oxide semiconductor films of Mg-doped NiO (NiMgO) have been prepared via a sol-gel method, and further optimized by several post-treatment strategies. The structures, properties and energy levels of different NiMgO films have been investigated to explore the influence of various post-treatment strategies. Incorporating the ternary NiMgO films as a novel type of hole transport layers (HTLs), non-fullerene OSCs have been fabricated based on a promising bulk-heterojunction of PM6:M36. Their photovoltaic performances and mechanisms of device physics are also investigated. When the sol-gel derived NiMgO film without post-treatment is used as an HTL, the OSCs show a relatively low power conversion efficiency (PCE) of 5.90%. By contrast, after simple ultraviolet-ozone (UVO) post-treatment on the NiMgO HTL, the resulted OSCs exhibit greatly enhanced photovoltaic performances, with an increased open-circuit voltage (V_OC) of 0.87 V and an improved PCE of 12.67%. More importantly, a new dual post-treatment combining surface rinse with UVO treatment has been demonstrated to further optimize NiMgO HTLs and improve device performances. The rinse process can remove excess impurities and flatten the surface of NiMgO films as well as increase the transmittance, while the UVO treatment process is beneficial for reducing surface defects of the ternary oxide films. Benefit-ing from such an efficient dual post-treatment on NiMgO HTLs, the OSCs afford a high PCE of 13.17% with a retained V_OC of 0.87 V, an increased short-circuit current density of 23.48 mA•cm^–2, and an improved fill factor of 64.29%. These results provide an effective way for surface post-treatment and property optimization of semiconducting metal oxide films, and contribute to the development of high-performance optoelectronic devices.

Key words: organic photovoltaic, ternary oxide, hole transport layer, surface treatment, interface engineering

Cite this article

Xinrui He, Lina Cai, Hansheng Chen, Pan Yin, Zhigang Yin, Qingdong Zheng. A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells^※[J]. Acta Chimica Sinica, 2022, 80(5): 581-589.

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Fig. & Tab. 10

Figure 1. X-Ray photoelectron spectroscopy (XPS) spectra of NiMgO films derived from different post-treatment methods

Figure 2. (a~d) Height images and (e~h) viscosity images of NiMgO films derived from different post-treatment methods

Figure 3. Contact angles of water and NiMgO films derived from different conditions including (a) without post-treatment, (b) only rinse, (c) only UVO treatment, and (d) dual post-treatment

Figure 4. (a) Transmission and (b) absorption spectra of NiMgO films derived from different post-treatment methods

NiMgO film	E_onset/eV	E_cutoff/eV	VBM/eV	CBM/eV	E_g^a/eV
N1	0.20	16.92	–4.50	–0.32	4.18
N2	0.13	17.15	–4.20	–0.04	4.16
N3	1.59	17.24	–5.57	–1.54	4.03
N4	1.49	17.42	–5.29	–1.20	4.09

Table 1. Energy level parameters and optical bandgap values of different NiMgO films

Figure 5. (a) UPS spectra of different NiMgO films and their enlarged views on (b) the low binding energy side and (c) the high binding energy side

Figure 6. (a) Schematic structure of OSCs and molecular structures of PM6 and M36 as well as (b) energy band diagram of materials used in the device

Figure 7. (a) J-V curves as well as (b) EQE spectra and integral current density curves of OSCs based on different NiMgO HTLs

NiMgO HTLs	V_OC/V	J_SC/(mA•cm^–2)	FF/%	PCE/%		R_Sh/(kΩ•cm²)	R_S/(Ω•cm²)
NiMgO HTLs	V_OC/V	J_SC/(mA•cm^–2)	FF/%	Best	Avg.	R_Sh/(kΩ•cm²)	R_S/(Ω•cm²)
N1	0.63	21.77	43.20	5.90	5.18	0.25	15.40
N2	0.55	21.19	46.30	5.40	5.05	0.29	11.45
N3	0.87	22.64	63.82	12.67	12.03	0.94	6.92
N4	0.87	23.48	64.29	13.17	12.61	0.93	6.02

Table 2. Device parameters of OSCs based on different NiMgO films as HTLs

Figure 8. (a) Jph-Veff curves, and light intensity dependent curves of JSC (b) and VOC (c) of OSCs based on different NiMgO HTLs

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表面双重后处理方法提升三元NiMgO半导体界面层及其有机太阳能电池的性能^※

A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells^※

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References 36

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表面双重后处理方法提升三元NiMgO半导体界面层及其有机太阳能电池的性能※

A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells※

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PDF

Supporting Info.

Knowledge

Abstract

Cite this article

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Fig. & Tab. 10

References 36

Related Articles 6

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表面双重后处理方法提升三元NiMgO半导体界面层及其有机太阳能电池的性能^※

A Dual Post-Treatment Method for Improving the Performance of Ternary NiMgO Semiconductor Interfacial Layers and Their Organic Solar Cells^※