Article
Chemistry, Physical
Jin-Woo Lee, Geon-U Kim, Dong Jun Kim, Yeonjee Jeon, Sheng Li, Taek-Soo Kim, Jung-Yong Lee, Bumjoon J. Kim
Summary: By adding a high-molecular weight polymer acceptor, efficient and mechanically robust active layers with high efficiency and stretchability can be constructed in organic solar cells.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jin-Woo Lee, Soodeok Seo, Sun-Woo Lee, Geon-U Kim, Seungseok Han, Tan Ngoc-Lan Phan, Seungjin Lee, Sheng Li, Taek-Soo Kim, Jung-Yong Lee, Bumjoon J. Kim
Summary: A series of new polymer donors (P(D)s, PhAmX), featuring a flexible spacer (PhAm-FS) based on phenyl amide, were developed to enhance the efficiency and stretchability of intrinsically stretchable organic solar cells (IS-OSCs).
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Gargi Ghosh, Atanu Bag, Adeela Hanif, Montri Meeseepong, Yu Rim Lee, Nae-Eung Lee
Summary: Research on transient wearable electronics is gaining interest due to their ability to seamlessly conform to human tissues and disappear when disposed. However, the challenge lies in finding materials that are both biodegradable and stretchable. This study addresses these challenges by developing a biodegradable nanofiber-reinforced water-borne polyurethane with stretchability, toughness, and partial biodegradability. The research demonstrates the potential of these materials for use in transient wearable electronics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Energy & Fuels
Dan Lv, Dianyi Liu
Summary: This study presents the fabrication of intrinsically stretchable fiber-shaped organic solar cells (FOSCs) using a polymer-based active layer. The all-polymer FOSCs demonstrate superior intrinsic stretchability, maintaining over 90% of the initial efficiency under a stretch strain of 50%. By incorporating SEBS elastomer, the FOSCs can withstand ultrahigh stretch strains of over 80% and retain 90% of the initial efficiency after 1000 stretching cycles.
Review
Chemistry, Multidisciplinary
Emilie Dauzon, Xavier Sallenave, Cedric Plesse, Fabrice Goubard, Aram Amassian, Thomas D. Anthopoulos
Summary: Emerging forms of soft, flexible, and stretchable electronics have the potential to revolutionize the future electronics industry, with stretchable photovoltaics as self-powering systems showing great promise for various applications. Current research is focused on achieving wearability and stretchability in electronic systems, utilizing both extrinsic and intrinsic approaches for inducing stretchability.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Wei Song, Qinrui Ye, Shuncheng Yang, Lin Xie, Yuanyuan Meng, Zhenyu Chen, Qun Gu, Daobin Yang, Jingyu Shi, Ziyi Ge
Summary: This study achieved a high power conversion efficiency of 18.06% and ultrahigh mechanical robustness in flexible organic solar cells by incorporating a linker dimerized acceptor. The ternary system exhibited reduced non-radiative recombination, suppressed crystallization and diffusion, and improved load distribution, surpassing binary systems in both efficiency and stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Meichen Xu, Di Zhang, Zhenye Wang, Zhitian Liu, Xiang Gao, Jiayi He, Yerun Gao, Zhilin Li, Ming Shao
Summary: Stretchable organic solar cells (OSCs) with enhanced power conversion efficiency (PCE) and stretchability were achieved by synthesizing copolymers with siloxane-terminated side chains. The siloxane side chains improved molecule aggregation, charge transport, and film morphology, leading to improved PCE. Moreover, the plasticizing effect of the side chains increased the stretchability of the blend film, with the highest stretchability reported to date. Therefore, this work provides practical guidelines for developing highly efficient and stretchable all-PSC.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Hyeong-Min Sim, Yu-Kyung Oh, Yunjeong Yu, Sunkook Kim, Han-Ki Kim
Summary: Highly-stretchable and semi-transparent superlattice electrodes based on polytetrafluoroethylene (PTFE)/AgPdCu (APC)-PTFE were developed. The electrical and mechanical properties of the electrodes were optimized by controlling the PTFE thickness and the number of layers. The electrodes showed excellent mechanical stretchability and optical switching capability, making them suitable for stretchable electronics.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jin-Woo Lee, Tan Ngoc-Lan Phan, Eun Sung Oh, Heung-Goo Lee, Taek-Soo Kim, Bumjoon J. Kim
Summary: Carboxylate-containing poly(thiophene vinylene) (PTV) derivatives with tuned molecular weight (MW) have been developed for intrinsically stretchable (IS) organic solar cells (OSCs). Increasing the MW of PTVs enhances their crystallinity, leading to improved hole mobility and reduced charge recombination. Furthermore, high MW PTVs exhibit superior mechanical stretchability and electrical properties due to the formation of tie-chains that connect the crystalline domains. Thus, IS-OSCs employing high MW PTVs demonstrate the highest power conversion efficiency (PCE) and strain at PCE80%.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Yalong Wang, Ziyang Zhou, Jianbang Zhou, Lihua Shao, Yao Wang, Yuan Deng
Summary: The study successfully enhanced the efficiency of organic thermoelectric generators (oTEG) by developing a special thermal interface that maximized temperature difference utilization. The research also demonstrated the excellent performance of oTEG under various thermal conditions and deformation conditions.
ADVANCED ENERGY MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Hanbee Lee, Zhi Jiang, Tomoyuki Yokota, Kenjiro Fukuda, Sungjun Park, Takao Someya
Summary: This review presents recent advances and challenges in the field of stretchable organic optoelectronics, focusing on advanced approaches such as material selection and structure engineering to maintain device performance under external stress, and discusses potential challenges and response strategies for further device development.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Myeungwoo Ryu, Jaeik Kim, Seungwoo Lee, Jeonghyun Kim, Taeseup Song
Summary: Stretchable devices allow for expanded applications in flexible displays and wearable devices/sensors, requiring methods for connecting unit devices and developing circuits. The development of a highly transparent PDMS-CNC composite paper has demonstrated excellent flexibility and stretchability, making it a suitable substrate for patterning circuits in flexible devices. The composite paper has shown to maintain high transparency, withstand large tensile strains, and only experience minor increase in resistance after deformation, making it a promising technology for fabricating electrical components in wearable and flexible electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Review
Chemistry, Multidisciplinary
Giwon Lee, Mohammad Zarei, Qingshan Wei, Yong Zhu, Seung Goo Lee
Summary: Recent advances in nanolithography, miniaturization, and material science, along with developments in wearable electronics, have pushed sensor technology to fabricate highly sensitive, flexible, stretchable, and multimodal detection systems. Surface wrinkling, as an effective alternative, improves the sensing performance and mechanical deformability of flexible and stretchable sensors by releasing stress, preventing failure, and enlarging surface areas. This study discusses the recent developments in wrinkling structures for sensor applications, including the mechanics, geometry control, and fabricating methods. It reviews the current state and impact on various sensor types, such as strain, pressure, temperature, chemical, photodetectors, and multimodal sensors. The study also extrapolates the existing wrinkling approaches, designs, and sensing strategies into future applications.
Article
Chemistry, Multidisciplinary
Zhenye Wang, Meichen Xu, Zhilin Li, Yerun Gao, Lvpeng Yang, Di Zhang, Ming Shao
Summary: Incorporating PDMS into organic solar cells improves stretchability without sacrificing photovoltaic performance. Devices fabricated using transfer printing exhibit high efficiency and transmittance, and demonstrate excellent flexibility and stability.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Xinzhao Xu, Yan Zhao, Yunqi Liu
Summary: Wearable electronics are gaining interest for the Internet of Things (IoT). Organic semiconductors with stretchability (SOSs) are promising for wearable electronics due to their excellent properties. Fabrication techniques, functionality classification, and potential challenges for SOS-based wearable electronics are reviewed in this paper.
Article
Chemistry, Multidisciplinary
Dahyun Jeong, Il-Young Jo, Seungjin Lee, Ji Hwan Kim, Youngseok Kim, Donguk Kim, John R. Reynolds, Myung-Han Yoon, Bumjoon J. Kim
Summary: Despite the limited number of high-performance n-type materials, this study develops a series of naphthalene diimide-based polymers with asymmetrically branched oligo(ethylene glycol) (OEG) side chains for green-solvent-processed, high-performance n-type organic electrochemical transistors (OECTs). The incorporation of branched OEG side chains enables solubility in eco-friendly ethanol/water solvent mixtures and produces highly ordered polymer packing with excellent lateral charge transport. The resulting n-type OECT exhibits the best electrical/electrochemical performance in the family, indicating important guidelines for the design of n-type organic mixed ionic-electronic conductors with excellent OECT characteristics.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hyeonjung Park, Youngkwon Kim, Donguk Kim, Seungjin Lee, Felix Sunjoo Kim, Bumjoon J. Kim
Summary: This study developed a series of fully degradable n-type CPs with high hydrolysis degradation capability and excellent electrical performance, providing useful guidelines for the design of fully degradable organic semiconductors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Soodeok Seo, Cheng Sun, Jin-Woo Lee, Seungjin Lee, Dongchan Lee, Cheng Wang, Tan Ngoc-Lan Phan, Geon-U Kim, Shinuk Cho, Yun-Hi Kim, Bumjoon J. Kim
Summary: By designing a new series of polymerized small molecule acceptor-based polymer acceptors, the authors controlled the donating moiety and backbone regioregularity to enhance electron mobility and power conversion efficiencies. The effects of different donating units and regioisomers on PCEs were found to be opposite, with the highest efficiency achieved by a specific blend with the highest electron mobility. The study highlights the importance of simultaneous engineering of the backbone building unit and regioregularity for high-mobility P-A and highly efficient all-PSCs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Cheng Sun, Jin-Woo Lee, Soodeok Seo, Seungjin Lee, Cheng Wang, Huan Li, Zhengping Tan, Soon-Ki Kwon, Bumjoon J. Kim, Yun-Hi Kim
Summary: Tuning the aggregation and crystalline properties of polymers is crucial for achieving optimal blend morphology and high power conversion efficiency in all-polymer solar cells (all-PSCs). Simultaneous engineering of PSMA backbone regioregularity and side-chain structures is important for enhancing electron mobility, optimizing blend morphology, and achieving highly efficient all-PSCs.
ADVANCED ENERGY MATERIALS
(2022)
Review
Chemistry, Physical
Youngkwon Kim, Hyeonjung Park, Jin Su Park, Jin-Woo Lee, Felix Sunjoo Kim, Hyeong Jun Kim, Bumjoon J. Kim
Summary: This review highlights recent advances in molecular design of conjugated polymers, focusing on the impact of tuning regioregularity (RR) on their properties and performances in organic electronics. We emphasize the importance of RR control in CPs design and its applications in efficient organic electronics.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Ayse Can, Gi-Seok Choi, Resul Ozdemir, Soyoon Park, Jin Su Park, Yongchul Lee, Ibrahim Deneme, Evren Mutlugun, Choongik Kim, Bumjoon J. Kim, Hakan Usta
Summary: The realization of pi-deficient acceptors and their donor-acceptor copolymers has become a key research focus for versatile organic optoelectronic materials and devices. This study demonstrates a unique meso-pi-extension strategy to realize BODIPYs with favorable pi-acceptor properties. The synthesized building blocks and copolymers exhibited promising electronic and structural properties suitable for various optoelectronic applications.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Geon-U Kim, Cheng Sun, Dongchan Lee, Gi-Seok Choi, Jin Su Park, Soodeok Seo, Seungjin Lee, Do-Yeong Choi, Soon-Ki Kwon, Shinuk Cho, Yun-Hi Kim, Bumjoon J. Kim
Summary: This study investigates the impacts of selective halogenation on the interfacial interactions, blend morphology, and photovoltaic properties of small molecular acceptors (SMAs). The results show that appropriate halogenation can improve blend morphology and enhance the efficiency of organic solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Polymer Science
Jeonga Kim, Muhammad Ahsan Saeed, Sung Hyun Kim, Dongmin Lee, Yongchan Jang, Jin Su Park, Donggu Lee, Changyeon Lee, Bumjoon J. Kim, Han Young Woo, Jae Won Shim, Wonho Lee
Summary: Organic indoor photovoltaics (IPVs) are attractive energy harvesting devices for low-power consumption electronic devices and the Internet of Things (IoTs). The polymer donor material, PBDTT, with a wide bandgap and deep HOMO level, was synthesized to match the absorption range of indoor light sources, and a series of random copolymers were made by incorporating TPD to fine tune the absorption range. Among them, the polymer with 70% TPD showed a dramatic enhancement of the power conversion efficiency in the indoor environment.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Dahyun Jeong, Min Je Kim, Seungjin Lee, Jin-Woo Lee, Youngwoong Kim, Hyeong Jun Kim, Jeong Ho Cho, Bumjoon J. Kim
Summary: This study successfully prepares N-type organic electrolyte-gated transistors (OEGTs) with high ionic conductivity and high performance by designing specific polymer structures.
SCIENCE CHINA-CHEMISTRY
(2022)
Article
Chemistry, Physical
Dahyun Jeong, Geon-U Kim, Dongchan Lee, Soodeok Seo, Seungjin Lee, Daehee Han, Hyeonjung Park, Biwu Ma, Shinuk Cho, Bumjoon J. Kim
Summary: The development of two sequentially fluorinated PT donors, PT-2F and PT-4F, with high backbone rigidity and temperature-dependent aggregation behavior, resulted in highly efficient OSCs with optimized blend morphology and high PCEs of 15.6% and 16.4%, respectively. By decreasing the energy levels and increasing the open-circuit voltages of the OSCs, the PT-4F polymers demonstrated improved crystalline structures in thin films for efficient charge transport.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jin-Woo Lee, Soodeok Seo, Sun-Woo Lee, Geon-U Kim, Seungseok Han, Tan Ngoc-Lan Phan, Seungjin Lee, Sheng Li, Taek-Soo Kim, Jung-Yong Lee, Bumjoon J. Kim
Summary: A series of new polymer donors (P(D)s, PhAmX), featuring a flexible spacer (PhAm-FS) based on phenyl amide, were developed to enhance the efficiency and stretchability of intrinsically stretchable organic solar cells (IS-OSCs).
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Jin-Woo Lee, Chulhee Lim, Sun-Woo Lee, Yeonji Jeon, Seungjin Lee, Taek-Soo Kim, Jung-Yong Lee, Bumjoon J. Kim
Summary: Incorporating hydrophilic oligo(ethylene glycol) flexible spacers into polymer solar cells (PSCs) improves mechanical strength and stretchability, as well as enhances charge generation and mechanical stress dissipation. This approach enables the development of efficient and stretchable PSCs suitable for wearable devices.
ADVANCED ENERGY MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Jin Su Park, Cheng Sun, Yunghee Han, Geon-U Kim, Tan Ngoc-Lan Phan, Yun-Hi Kim, Bumjoon J. Kim
Summary: By using SMAs with enhanced aggregation behavior and processability, high-performance organic solar cells can be fabricated through green solvent processing. Notably, OSCs fabricated using nonhalogenated solvent and annealing-free process have higher power conversion efficiencies.
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
(2022)