Fmoc-FF-OH钝化钙钛矿薄膜及其太阳能电池性能研究

doi:10.15541/jim20230050

无机材料学报 ›› 2023, Vol. 38 ›› Issue (9): 1076-1082.DOI: 10.15541/jim20230050

所属专题：【能源环境】钙钛矿(202310)；【能源环境】太阳能电池(202310)

Fmoc-FF-OH钝化钙钛矿薄膜及其太阳能电池性能研究

丁统顺¹(), 丰平²(), 孙学文¹, 单沪生¹, 李琪², 宋健¹()

1.中国矿业大学材料与物理学院, 徐州 221116
2.江苏华恒新能源有限公司, 徐州 221122

收稿日期:2023-02-01 修回日期:2023-04-02 出版日期:2023-09-20 网络出版日期:2023-05-04
通讯作者: 丰平, 博士. E-mail: ping.feng@solarspace.cn;
宋健, 讲师. E-mail: jsoong@cumt.edu.cn
作者简介:丁统顺(1998-), 男, 硕士研究生. E-mail: TS21180067P31@cumt.edu.cn
基金资助:
国家自然科学基金(52203369);徐州市产业重点技术研发(ZYQ20210189)

Perovskite Film Passivated by Fmoc-FF-OH and Its Photovoltaic Performance

DING Tongshun¹(), FENG Ping²(), SUN Xuewen¹, SHAN Husheng¹, LI Qi², SONG Jian¹()

1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
2. Jiangsu Huaheng New Energy Company, Xuzhou 221122, China

Received:2023-02-01 Revised:2023-04-02 Published:2023-09-20 Online:2023-05-04
Contact: FENG Ping, PhD. E-mail: ping.feng@solarspace.cn;
SONG Jian, lecturer. E-mail: jsoong@cumt.edu.cn
About author:DING Tongshun (1998-), male, Master candidate. E-mail: TS21180067P31@cumt.edu.cn
Supported by:
National Natural Science Foundation of China(52203369);Industry Key Technology R&D Program of Xuzhou(ZYQ20210189)

摘要/Abstract

摘要：

有机-无机杂化钙钛矿具有高的光吸收系数、可调节的带隙以及双极性的电荷传导特性, 是一种理想的光吸收材料。然而, 溶液法制备的钙钛矿薄膜在表/界面上存在多种缺陷, 会抑制载流子传输并引发复合。本研究选用含多官能团的氨基酸衍生物——9-芴甲氧羰基-L-苯丙氨酸-L-苯丙氨酸(Fmoc-FF-OH)作为添加剂来降低钙钛矿膜缺陷并抑制晶界上的载流子复合。结果表明, 当Fmoc-FF-OH的浓度为0.6 g·L^-1时, 钙钛矿薄膜的粒径从138 nm增大到210 nm, 缺陷态密度从2.46×10¹⁵ cm^-3降低至2.17×10¹⁵cm^-3。同时, 钙钛矿太阳能电池也表现出最优的性能, 开路电压从1.05 V提升到1.10 V, 器件的光电转化效率(PCE)从15.50%提升到17.44%。在220 h的稳定性测试中, 器件的光电转化效率仍能维持初始的71%。

关键词: 钙钛矿太阳能电池, 界面钝化, 氨基酸衍生物

Abstract:

Organic-inorganic hybrid perovskite is an ideal light absorption material due to its high light absorption coefficient, adjustable band gap and bipolar charge conduction characteristics. However, perovskite thin films prepared by solution method possess various defects in the surface and interface, which inhibit carrier transport and trigger recombination. In this study, a multifunctional amino acid derivative, 9-fluorenylmethoxycarbonyl- L-phenylalanine-L-phenylalanine (Fmoc-FF-OH), was selected as an additive to reduce defects of perovskite film and to inhibit carrier recombination at grain boundaries. When the concentration of Fmoc-FF-OH is 0.6 g·L^-1, the particle size of the perovskite thin film increases from 138 to 210 nm, and the defect state density decreases from 2.46×10¹⁵ to 2.17×10¹⁵cm^-3. Perovskite solar cells also exhibit optimal performance with open circuit voltage increasing from 1.05 to 1.10 V, and photoelectric conversion efficiency (PCE) improved from 15.50% to 17.44%. After stability test for 220 h, the photoelectric conversion efficiency of the device can still maintain 71% of the initial.

Key words: perovskite solar cell, interface passivation, amino acid derivative

中图分类号:

TQ174

丁统顺, 丰平, 孙学文, 单沪生, 李琪, 宋健. Fmoc-FF-OH钝化钙钛矿薄膜及其太阳能电池性能研究[J]. 无机材料学报, 2023, 38(9): 1076-1082.

DING Tongshun, FENG Ping, SUN Xuewen, SHAN Husheng, LI Qi, SONG Jian. Perovskite Film Passivated by Fmoc-FF-OH and Its Photovoltaic Performance[J]. Journal of Inorganic Materials, 2023, 38(9): 1076-1082.

图/表 12

图1 (a) Fmoc-FF-OH的分子结构和 (b)添加不同浓度Fmoc-FF-OH的钙钛矿薄膜XRD图谱

Fig. 1 (a) Molecular structure of Fmoc-FF-OH and (b) XRD patterns of perovskite films with different concentrations of Fmoc-FF-OH

图2 添加不同浓度nFmoc-FF-OH的钙钛矿薄膜的SEM照片及粒径分布直方图

Fig. 2 SEM images and particle size distributions of perovskite films with different Fmoc-FF-OH concentrations (a) 0 g·L-1; (b) 0.2 g·L-1; (c) 0.4 g·L-1; (d) 0.6 g·L-1; (e) 0.8 g·L-1

图3 未添加与添加0.6 g·L-1 Fmoc-FF-OH的钙钛矿薄膜的(a) Pb4f, (b )Br3d XPS窄扫谱图

Fig. 3 (a) Pb4f, (b) Br3d XPS spectra of perovskite films without and with addition of 0.6 g·L-1 Fmoc-FF-OH

图4 (a)添加不同浓度Fmoc-FF-OH的钙钛矿薄膜的PL谱图, (b)UV-Vis吸收谱图和(c)TRPL谱图

Fig. 4 (a) PL spectra, (b) UV-Vis spectra and (c) TRPL spectra of perovskite thin films with different concentrations of Fmoc-FF-OH; Colorful figures are available on website

图5 添加Fmoc-FF-OH对PSCs光伏性能的影响

Fig. 5 Effects of addition of Fmoc-FF-OH on the PSCs photovoltaic performance (a) J-V curves of PSCs with different concentrations of Fmoc-FF-OH; (b) Forward and reverse J-V curves for PSCs, (c) IPCE and integral current curves, (d) pure hole I-V curves under dark conditions and (e) electrochemical impedance spectra of PSCs without and with 0.6 g·L-1 Fmoc-FF-OH Colorful figures are available on website

表1 添加不同浓度Fmoc-FF-OH的PSCs光伏参数

Table 1 Photovoltaic parameters of PSCs with different concentrations of Fmoc-FF-OH

Concentration (g·L^-1)	Direction	V_OC/V	J_SC/(mA·cm^-2)	FF/%	PCE/%	Hysteresis Index
0	Reverse	1.05	19.28	76.05	15.50	0.11
0	Forward	1.02	17.53	74.76	13.39	0.11
0.2	Reverse	1.06	19.23	78.74	16.12	—
0.4	Reverse	1.06	19.37	78.37	16.24	—
0.6	Reverse	1.10	19.94	79.47	17.44	0.07
0.6	Forward	1.09	19.03	77.36	16.10	0.07
0.8	Reverse	1.07	18.94	77.98	15.91	—

图6 (a)未添加与添加0.6 g·L-1 Fmoc-FF-OH的PSCs器件的PCE稳定性测试结果; (b)添加0.6 g·L-1 Fmoc-FF-OH的PSCs恒压电流曲线

Fig. 6 (a) PCE stability test for PSCs devices without and with 0.6 g·L-1 Fmoc-FF-OH; (b) Constant voltage current curves of PSCs with 0.6 g·L-1 Fmoc-FF-OH

图S1 钙钛矿太阳能电池器件结构图

Fig. S1 Structure diagram of PSCs device

图S2 (a)未添加和添加0.6 g·L-1 Fmoc-FF-OH的钙钛矿薄膜XPS总谱图和(b) I3d, (c) Cs3d XPS窄扫谱图

Fig. S2 (a)Total and (b) I3d, (c) Cs3d XPS spectra of perovskite thin films without and with addition of 0.6 g·L-1 Fmoc-FF-OH

图S3 (a)未添加和(b)添加0.6 g·L-1 Fmoc-FF-OH钙钛矿薄膜的Tauc图

Fig. S3 Tauc plots perovskite thin films (a) without and (b) with addition of 0.6 g·L-1 Fmoc-FF-OH

表S1 添加不同浓度Fmoc-FF-OH的钙钛矿薄膜TRPL拟合参数

Table S1 TRPL fitting parameters of perovskite films with addition of different concentrations of Fmoc-FF-OH

Concentration (g·L^-1)	A₁	τ₁/ns	A₂	τ₂/ns	τ_ave/ns
0	12.03	4	87.97	125	124.47
0.2	11.12	7	88.88	133	132.17
0.4	5.04	10	94.98	231	230.49
0.6	0.12	6	99.88	332	331.99
0.8	3.79	8	96.21	226	225.67

图S4 (a)未添加和(b)添加0.6 g·L-1 Fmoc-FF-OH的钙钛矿薄膜的接触角

Fig. S4 Contact Angles of perovskite films (a) without and (b) with 0.6 g·L-1 Fmoc-FF-OH

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Fmoc-FF-OH钝化钙钛矿薄膜及其太阳能电池性能研究

Perovskite Film Passivated by Fmoc-FF-OH and Its Photovoltaic Performance

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