氯取代近红外双缆共轭高分子材料与低能量损失单组分有机太阳能电池

doi:10.3866/PKU.WHXB202307037

物理化学学报 >> 2024, Vol. 40 >> Issue (8): 2307037.doi: 10.3866/PKU.WHXB202307037

氯取代近红外双缆共轭高分子材料与低能量损失单组分有机太阳能电池

李若男¹, 梁世洁², 许韵华¹^,*(), 张翠芬⁴, 唐正⁴, 刘柏侨³^,*(), 李韦伟²^,*()

¹ 北京交通大学物理科学与工程学院, 北京 100044
² 北京化工大学有机无机复合材料国家重点实验室, 北京 100029
³ 之江实验室, 智能芯片与器件研究中心, 杭州 311121
⁴ 东华大学先进低维材料中心, 上海 201620

收稿日期:2023-07-20 修回日期:2023-09-17 录用日期:2023-09-20 发布日期:2023-09-25
通讯作者: Email: yhxu@bjtu.edu.cn (许韵华)liubaiqiao@bjtu.edu.cn (刘柏侨)liweiwei@iccas.ac.cn (李韦伟)
基金资助:
国家自然科学基金(52073016); 国家自然科学基金(22105180)

Chlorine-Substituted Double-Cable Conjugated Polymers with Near-Infrared Absorption for Low Energy Loss Single-Component Organic Solar Cells

Ruonan Li¹, Shijie Liang², Yunhua Xu¹^,*(), Cuifen Zhang⁴, Zheng Tang⁴, Baiqiao Liu³^,*(), Weiwei Li²^,*()

¹ School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China
² State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
³ Research Center for Intelligent Chips and Devices, Zhejiang Lab, Hangzhou 311121, China
⁴ State Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China

Received:2023-07-20 Revised:2023-09-17 Accepted:2023-09-20 Published:2023-09-25
Contact: Email: yhxu@bjtu.edu.cn (Yunhua Xu)liubaiqiao@bjtu.edu.cn (Baiqiao Liu)liweiwei@iccas.ac.cn (Weiwei Li)
Supported by:
the National Natural Science Foundation of China(52073016); the National Natural Science Foundation of China(22105180)

1. WHXB202307037-SI-11p.pdf(2480KB)

摘要/Abstract

摘要：

近红外型双缆共轭高分子材料的光电转换效率(PCE)已经超过了10%，然而较大的能量损失限制了其性能的进一步提升。本工作中，我们合成了两个氯取代的近红外双缆共轭聚合物材料，分别命名为as-DCPIC-Cl和as-DCPIC-2Cl。氯原子的引入使得单组分有机太阳能电池的能量损失低至0.57 eV。其中，基于as-DCPIC-Cl的器件实现了10.14%的PCE，为基于非稠环电子受体的双缆共轭聚合物的最高性能。研究表明，氯原子在实现高性能单组分有机太阳能电池方面具有重要的作用。

关键词: 双缆共轭高分子, 单组分有机太阳能电池, 近红外, 能量损失

Abstract:

Single-component organic solar cells (SCOSCs) have emerged as promising candidates for renewable energy applications due to their simplified film fabrication process and well-controlled morphology. High-performance SCOSCs typically employ active layer materials comprising block copolymers and double-cable conjugated polymers. Among these, double-cable conjugated polymers have attracted a lot of interest in SCOSCs due to their precisely defined structure and easily controllable microphase morphology. In the early stages of double-cable conjugated polymers, most of them contain the polythiophene backbone and fullerene side units, severely limiting the development of SCOSCs. Fortunately, the emergence of novel materials has progressively led to the development of new types of double-cable conjugated polymers. Double-cable conjugated polymers based on acylimide compound have exhibited device performances exceeding 8%. Nevertheless, acylimide-type electron acceptors exhibit a limited photo-response range, resulting in lower photocurrents in SCOSCs. The utilization of A-D-A-type electron acceptors (where D represents electron-donating groups and A represents electron-withdrawing groups) have effectively broadened the absorption spectra of materials due to induced intramolecular charge transfer. Double-cable polymers using A-D-A-type electron acceptors as the side units have achieved efficiencies exceeding 10%. However, significant voltage losses have hampered further improvements in their performance. Chlorine atoms play a crucial role in organic solar cells due to enhanced crystallinity in both chlorine-substituted donor polymers and acceptor molecules, and they can also adjust material energy levels and optimize film morphology. Nevertheless, their role in SCOSCs has been scarcely explored. This limitation arises from the increased complexity of morphology control in double-cable conjugated polymers, where the donor and acceptor segments are covalently linked in one molecule making their crystalline behavior more complicated on account of their mutual restraint. In this study, we have designed and synthesized chlorine-substituted double-cable conjugated polymers, denoted as as-DCPIC-Cl and as-DCPIC-2Cl. The results indicate that the introduction of chlorine atoms into the conjugated backbone reduces energy losses in the devices, resulting in an enhancement of open-circuit voltage (V_OC). However, the introduction of chlorine atoms also leads to unbalanced charge transport and increased trap-assisted charge recombination, causing a decrease in the fill factor (FF) and short-circuit current density (J_SC). Meanwhile, Grazing-incidence wide-angle X-ray scattering (GIWAXS) tests demonstrate that the introduction of chlorine atoms does not affect the aggregation/crystallization behavior of acceptor units. SCOSCs based on as-DCPIC-Cl achieved a power conversion efficiency (PCE) of 10.14%, which is among the best PCEs reported for SCOSCs based on non-fused electron acceptors.

Key words: Double-cable conjugated polymer, Single-component organic solar cell, Near-infrared, Energy loss

李若男, 梁世洁, 许韵华, 张翠芬, 唐正, 刘柏侨, 李韦伟. 氯取代近红外双缆共轭高分子材料与低能量损失单组分有机太阳能电池[J]. 物理化学学报, 2024, 40(8), 2307037. doi: 10.3866/PKU.WHXB202307037

Ruonan Li, Shijie Liang, Yunhua Xu, Cuifen Zhang, Zheng Tang, Baiqiao Liu, Weiwei Li. Chlorine-Substituted Double-Cable Conjugated Polymers with Near-Infrared Absorption for Low Energy Loss Single-Component Organic Solar Cells[J]. Acta Phys. -Chim. Sin. 2024, 40(8), 2307037. doi: 10.3866/PKU.WHXB202307037

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB202307037

https://www.whxb.pku.edu.cn/CN/Y2024/V40/I8/2307037

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	M_n/kDa	M_w/kDa	Ð_M	λ_onset^sol /nm ^a	λ_onset^film /nm ^b	E_g^film/eV ^c	E_HOMO/eV ^d	E_LUMO /eV ^d
as-DCPIC-Cl	157.7	333.9	2.11	771	805	1.54	−5.59	−3.77
as-DCPIC-2Cl	84.2	216.3	2.57	771	828	1.50	−5.61	−3.75

Polymers	V_OC/V ^a	J_SC/(mA·cm⁻²) ^a	FF ^a	PCE/% ^a	E_loss/eV ^b
as-DCPIC	0.754 (0.746 ± 0.005)	21.46 (20.92 ± 0.45)	0.63 (0.62 ± 0.01)	10.12 (9.72 ± 0.11)	0.79
as-DCPIC-Cl	0.856 (0.845 ± 0.003)	20.17 (19.98 ± 0.59)	0.58 (0.58 ± 0.01)	10.14 (9.97 ± 0.09)	0.68
as-DCPIC-2Cl	0.927 (0.926 ± 0.001)	18.33 (17.49 ± 0.26)	0.54 (0.54 ± 0.01)	9.25 (9.02 ± 0.11)	0.57

Polymers	E_CT/eV	V_loss/V ^a	∆V_nr/V	∆V_r/V ^b
as-DCPIC-Cl	1.41	0.55	0.32	0.23
as-DCPIC-2Cl	1.44	0.51	0.27	0.24

Polymers	D(200)			D(010)
Polymers	q/nm⁻¹	d/nm	CL (nm) ^a	q/nm⁻¹	d/nm	CL (nm) ^a
as-DCPIC	3.47	3.62	9.24	17.6	0.357	2.47
as-DCPIC-Cl	3.47	3.62	10.9	17.6	0.357	2.46
as-DCPIC-2Cl	3.47	3.62	10.1	17.6	0.357	2.35

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氯取代近红外双缆共轭高分子材料与低能量损失单组分有机太阳能电池

Chlorine-Substituted Double-Cable Conjugated Polymers with Near-Infrared Absorption for Low Energy Loss Single-Component Organic Solar Cells

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