• 特约专栏:纺织品可穿戴与智能化 •

### PEDOT:PSS在柔性可穿戴太阳能电池中的应用进展

1. 浙江理工大学,a.材料科学与工程学院;b.纺织科学与工程学院(国际丝绸学院),杭州 310018
• 收稿日期:2022-04-19 出版日期:2023-01-10 网络出版日期:2023-01-17
• 通讯作者:熊杰,E-mail: jxiong@zstu.edu.cn
• 作者简介:吕东方(1997—),男,河南信阳人,硕士研究生,主要从事柔性可穿戴钙钛矿太阳能电池方面的研究。
• 基金资助:
浙江省自然科学基金项目(LQ19E030020)

### Application progress on PEDOT:PSS in flexible wearable solar cells

LÜ Dongfanga, CAO Yiminb, SONG Lixinb, XIONG Jieb

1. a. School of Materials Science & Engineering; b. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310018, China
• Received:2022-04-19 Published:2023-01-10 Online:2023-01-17

Abstract: Poly(3,4-ethylenedioxythiophene): polystyrene sulfonic acid (PEDOT:PSS) which is a kind of conductive polymer with superior electrical conductivity and excellent flexibility, has great potential in the field of wearable solar cells. At present, more and more people are focusing on the application research of flexible solar cells in wearability, so as to solve a series of problems about flexible solar cells, including flexibility, specific power, portability and compatibility. PEDOT:PSS, as electrode and hole transport layer, plays an important role in the research of different flexible solar cells, which promotes the rapid development of flexible solar cells.
As an electrode, PEDOT:PSS plays a different role in DSSCs, OSCs, PSCs, and the modification methods are also slightly different. In DSSCs, PEDOT:PSS has high room temperature conductivity and remarkable stability, which can catalyze the I3-/I- redox reaction in solar cells. In terms of performance improvement, doping-based research ideas have been formed. The preparation process is simple, non-toxic, environmentally friendly and involve excellent electrocatalytic activity. In OSCs, the emergence of PEDOT:PSS can replace the traditionally expensive ITO, and the non-conductive component PSS in the polymer can be removed by solvent post-treatment and other methods, which significantly improves the conductivity of the PEDOT:PSS electrode. In PSCs, PEDOT:PSS can be used as a transparent substrate electrode and a top electrode of flexible PSCs, respectively. After further modification of PEDOT:PSS by doping or post-treatment, the conductivity of PEDOT:PSS as a conventional electrode is further improved, and its optical transmittance is further enhanced as a top electrode, which enables the performance of the battery device to ensure a high energy conversion efficiency. In terms of flexibility, compared with the traditional battery devices constructed by metal electrodes or ITO electrodes, the devices constructed by modified PEDOT:PSS can still maintain a level comparable to the initial efficiency after bending for hundreds of times, which provides a new idea for the development of efficient and stable flexible optoelectronic devices.
As a hole transport layer, PEDOT:PSS is only used in OSCs and PSCs due to the different structures of solar cells. In OSCs, PEDOT:PSS has a wide range of advantages as a hole transport layer. Its solution processing characteristics make it suitable for large-scale production, and it has excellent performance in smoothing electrode interface and extracting holes. Post-treatment or doping is often used to solve the problem that the strong acidity of PEDOT:PSS leads to the low efficiency of the battery. On the one hand, the acidity of PEDOT:PSS is reduced, and on the other hand, the electrochemical and optical properties of PEDOT:PSS can be improved, thus greatly improving the efficiency of OSCs. In PSCs, PEDOT:PSS is widely used as hole transport layer materials due to its matching energy level with perovskite and suitable conductivity, and simple preparation at low temperature. After doping-based modification, the energy level between PEDOT:PSS and perovskite is more matched, the carrier mobility and hole extraction ability are improved, and the efficiency of PSCs is significantly improved. Through the optimization of the preparation process, the stability and mechanical flexibility are also well balanced, which makes flexible wearable PSCs possible.
For flexible wearable solar cells, there are two primary problems: how to prepare high-efficiency and high-flexibility battery devices, and how to improve the stability of the battery while maintaining high efficiency and high flexibility. The application of PEDOT:PSS as electrode and hole transport layer in different flexible solar cells is becoming increasingly extensive. Researchers have continuously improved and optimized the electrode materials of flexible solar cells by such methods as doping, post-processing and so on. In these solutions, PEDOT:PSS has also made an irreplaceable contribution to the development of flexible solar cells, which is of far-reaching significance.