Article
Materials Science, Multidisciplinary
Zhongyuan Xue, Ruitao Yu, Mengyuan Zhu, Yijing Wu, Yinming He, Xuyu Gao, Youtian Tao
Summary: By introducing chlorinated substitution in the thiophene side-chain of the benzo[1,2-b:4,5-b']dithiophene unit, the conjugated polymer PDPP-BDT-Cl is designed to have a 0.18 eV deeper HOMO energy level than the non-chlorinated PDPP-BDT. When used in PSCs with PC71BM acceptor, PDPP-BDT-Cl based PSCs achieve higher VOC of 0.86 V and average PCE of 5.02%, showing better photovoltaic performance compared to PDPP-BDT. Additionally, PDPP-BDT-Cl polymer exhibits improved thickness tolerance and stable photovoltaic performance due to better donor/acceptor miscibility.
Article
Chemistry, Physical
Hak-Won Nho, Won-Woo Park, Byongkyu Lee, Seoyoung Kim, Changduk Yang, Oh-Hoon Kwon
Summary: By studying the photophysics of the high-performance donor-acceptor polymer PM6 in single chains, the formation of CT states and their equilibrium with parent LE states can be revealed, which is essential for optimizing organic photovoltaic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Ghulam Bary, Lubna Ghani, Muhammad Imran Jamil, Muhammad Arslan, Waqar Ahmed, Anees Ahmad, Muhammad Sajid, Riaz Ahmad, Duohui Huang
Summary: Non-fullerene acceptors A1-A5 with diflourobenzene or quinoline core units were designed using DFT calculations, showing good photovoltaic properties and suitability for organic solar cells.
SCIENTIFIC REPORTS
(2021)
Article
Polymer Science
Hang Yang, Sunan Bao, Hongyu Fan, Chenling Fan, Xianming Zhu, Chaohua Cui, Yongfang Li
Summary: This study successfully develops high-performance all-polymer solar cells by designing two polymerized small molecule acceptors. The open-circuit voltage is increased and the efficiency of the cells is improved by selecting appropriate linking units.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Jun Yuan, Chujun Zhang, Beibei Qiu, Wei Liu, Shu Kong So, Mathieu Mainville, Mario Leclerc, Safa Shoaee, Dieter Neher, Yingping Zou
Summary: Organic solar cells (OSCs) have made rapid progress in recent years through the development of novel organic photoactive materials, particularly non-fullerene acceptors (NFAs). However, the understanding of the interplay between molecular structure and optoelectronic properties lags significantly behind. The potential role of energetic disorder in OSCs has received little attention, but recent studies have shown that state-of-the-art NFA-based devices can achieve both low energetic disorder and high power conversion efficiency (PCE).
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Tomohiro Fukuhara, Koshi Yamazaki, Takuto Hidani, Masahiko Saito, Yasunari Tamai, Itaru Osaka, Hideo Ohkita
Summary: This study investigates the origin of differences in open-circuit voltage (V-OC) for polymer:fullerene solar cells utilizing highly crystalline conjugated polymers (PTzBT) with the same thiophene-thiazolothiazole backbone but different side chains. The findings suggest that the difference in V-OC is attributed to the distinct cascaded energy structures for the highest occupied molecular orbital (HOMO) levels in the interfacial mixed phase. Additionally, it is revealed that the stabilization of HOMO is influenced by the branching of side chains, as supported by density functional theory calculations.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Matthias Auf Der Maur, Gilad Moses, Jeffrey M. Gordon, Xuanqi Huang, Yuji Zhao, Eugene A. Katz
Summary: This study analyzed the temperature and intensity dependence of open-circuit voltage of InGaN/GaN multi-quantum well solar cells in high temperature and high illumination conditions. The results show that the simple ABC model can accurately reproduce this dependence, with consideration of temperature-dependent lifetime and device heating.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Multidisciplinary
Nrup Balar, Jeromy James Rech, Salma Siddika, Runqiao Song, Harry M. Schrickx, Nadeem Sheikh, Long Ye, Anthony Megret Bonilla, Omar Awartani, Harald Ade, Wei You, Brendan T. O'Connor
Summary: This study investigates the thermomechanical behavior of a series of polymers based on benzodithiophene using dynamic mechanical analysis, revealing three prominent relaxation transitions. Side chains play a crucial role in determining T-gamma, with mixing different side chain chemistries resulting in splitting of the gamma-relaxation. Through processing, it is shown that the alpha-relaxation is due to aggregate formation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Polymer Science
Gang Ye, Jian Liu, Xinkai Qiu, Sebastian Stater, Li Qiu, Yuru Liu, Xuwen Yang, Richard Hildner, L. Jan Anton Koster, Ryan C. Chiechi
Summary: The type and position of pendant groups have a significant impact on the n-doping efficiency of low-band gap D-A copolymers. The addition of polar groups not only increases the electron affinity of the copolymers, but also improves the host/dopant miscibility, resulting in a 40-fold increase in doping efficiency. The incorporation of polar groups also enhances the bulk mobility of doped films, leading to improved electrical properties.
Article
Chemistry, Multidisciplinary
Ping Hu, Shiqi Huang, Minghuang Guo, Yafeng Li, Mingdeng Wei
Summary: The use of DMII ionic liquid as an additive can enhance the quality of perovskite films, reduce defects, improve crystal crystallinity, and increase the efficiency and stability of photovoltaic devices.
Article
Multidisciplinary Sciences
Maximilian Raisch, Wafa Maftuhin, Michael Walter, Michael Sommer
Summary: By designing a mechanochromic donor-acceptor torsional spring, force-dependent red-shifted absorption and emission spectra can be achieved, allowing for sensing and measuring forces, as well as visualizing force distributions in materials.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Bin Huang, Yujun Cheng, Hui Jin, Jiabin Liu, Xuexiang Huang, Yongjie Cui, Xunfan Liao, Changduk Yang, Zaifei Ma, Lie Chen
Summary: By manipulating the energy level and E-U of the polymer donor, the V-OC and E-loss of the device can be effectively controlled to achieve highly efficient OSCs. The study successfully achieved low energetic disorder and energy loss, as well as high V-OC in PBDS-TCl:Y6-based OSCs, laying the foundation for achieving excellent performance.
Article
Energy & Fuels
Chia-Hsun Chen, Chien-Ju Chen, Yi-An Chen, Yu-Hsiang Chang, Hsiao-Chiao Liu, Yuan-Chih Lo, Bo-Yen Lin, Chien-Liang Lin, Connor J. Easley, Christopher J. Bardeen, Yi-Sheng Chen, Jiun-Haw Lee, Tien-Lung Chiu, Ken-Tsung Wong
Summary: Three new donor-acceptor-acceptor' (D-A-A')-configured molecules were synthesized and characterized, with different F-substituted benzothiadiazole (BT) and pyridal[2,1,3]-thiadiazole (PTD) as acceptor groups. The effects of substitution number and orientation on physical properties, intermolecular interactions, and device performance were investigated. DTCFiBT showed the best performance in small-molecule organic solar cells due to its deeper HOMO level and superior exciton separation and charge carrier transport.
Article
Multidisciplinary Sciences
Xiaoling Ma, Anping Zeng, Jinhua Gao, Zhenghao Hu, Chunyu Xu, Jae Hoon Son, Sang Young Jeong, Caixia Zhang, Mengyang Li, Kai Wang, He Yan, Zaifei Ma, Yongsheng Wang, Han Young Woo, Fujun Zhang
Summary: A series of ternary organic photovoltaics have been successfully fabricated by incorporating Y6-1O, which leads to an increase in open-circuit voltage and power conversion efficiency of the devices. By finely adjusting the content of Y6-1O, the optimal device with 30% Y6-1O achieves a conversion efficiency of 17.91%, with significantly improved short-circuit current density and fill factor.
NATIONAL SCIENCE REVIEW
(2021)
Article
Chemistry, Multidisciplinary
Daniela Cappello, Francis L. Buguis, Joe B. Gilroy
Summary: Molecular materials with pi-conjugated donor-acceptor and acceptor-donor-acceptor structures have versatile applications in organic photovoltaic materials, organic light-emitting diodes, and biological imaging agents. Boron-containing compounds with unique optoelectronic and redox properties are synthesized using Stille cross-coupling chemistry. The compounds exhibit reversible redox waves, solid-state emission, and aggregation-induced emission. The optical band gaps determined from experiments and density functional theory calculations support the rationalization of the observed optoelectronic properties. This study provides a foundation for incorporating these boron-containing compounds into applications that require fine-tuning of band gaps.
Article
Electrochemistry
Duk Man Yu, Tae-Ho Kim, Jang Yong Lee, Sangjun Yoon, Young Taik Hong
ELECTROCHIMICA ACTA
(2015)
Article
Polymer Science
Kyung Seok Yoon, Jang Yong Lee, Tae-Ho Kim, Duk Man Yu, Sung-Kwon Hong, Young Taik Hong
EUROPEAN POLYMER JOURNAL
(2015)
Article
Chemistry, Physical
Soo-Whan Nam, Duk Man Yu, Tae-Ho Kim, Jang Yong Lee, Sang Yong Nam, Young Taik Hong
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2016)
Article
Engineering, Chemical
Sang Geun Jo, Tae-Ho Kim, Sang Jun Yoon, Seong-Geun Oh, Min Suc Cha, Hee Young Shin, Ji Min Ahn, Jang Yong Lee, Young Taik Hong
JOURNAL OF MEMBRANE SCIENCE
(2016)
Article
Chemistry, Physical
Jung-Kyu Jang, Tae-Ho Kim, Sang Jun Yoon, Jang Yong Lee, Jong-Chan Lee, Young Taik Hong
JOURNAL OF MATERIALS CHEMISTRY A
(2016)
Article
Chemistry, Multidisciplinary
Hongrae Jeon, Jae Hee Han, Duk Man Yu, Jang Yong Lee, Tae-Ho Kim, Young Taik Hong
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2017)
Article
Engineering, Chemical
Min Suc Cha, Jang Yong Lee, Tae-Ho Kim, Hwan Yeop Jeong, Hee Young Shin, Seong-Geun Oh, Young Taik Hong
JOURNAL OF MEMBRANE SCIENCE
(2017)
Article
Chemistry, Physical
Min Suc Cha, Sang Woo Jo, Seung Hui Han, Soo Hyun Hong, Soonyong So, Tae-Ho Kim, Seong-Geun Oh, Young Taik Hong, Jang Yong Lee
JOURNAL OF POWER SOURCES
(2019)
Article
Chemistry, Multidisciplinary
Soo Hyun Hong, Min Suc Cha, Sung-Kwon Hong, Seong-Geun Oh, Jang Yong Lee
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2019)
Article
Chemistry, Multidisciplinary
Seung Jae Hong, Sang Jun Yoon, Tae-Ho Kim, Jang Yong Lee, Seong-Geun Oh, Young Taik Hong, Soonyong So, Duk Man Yu
Summary: A facile method for fabricating mechanically tough proton exchange membranes was demonstrated, using surface treatment with alcohol solvents to improve the performance of composite membranes and successfully achieve good impregnation of ionomer solution into the substrate pores. The use of alcohol treatment effectively tuned the surface property of the substrate pores, leading to the fabrication of apparently translucent and almost void-free composite membranes with enhanced mechanical strength.
Article
Chemistry, Multidisciplinary
Sohee Kim, Ji Hee Kim, Jae Hee Han, Jang Yong Lee, Soonyong So, Sang Jun Yoon, Hyung-Joong Kim, Kyu Tae Lee, Tae-Ho Kim
Summary: Introducing SiO2 nanoparticles into composite gel polymer electrolytes and utilizing in situ cross-linking reactions between the SiO2 surface and silane groups in the precursor can increase the material's cross-linking density, reduce polymer-chain ordering, and enhance both ionic conductivity and mechanical strength. All-solid-state supercapacitors assembled with this electrolyte exhibit high operating voltage, large specific capacitance, and excellent cycling stability.
Article
Chemistry, Physical
Sungyu Choi, Sang-Hun Shin, Dong-Hyun Lee, Gisu Doo, Dong Wook Lee, Jonghyun Hyun, Jang Yong Lee, Hee-Tak Kim
Summary: The study introduces a radical-scavenger-embedded interlocking interfacial layer (IIL) to address delamination issue between hydrocarbon membranes and Nafion-based catalyst layers. The ball-socket joint structure of the IIL enables mechanical interlocking at the interface, with cerium oxide acting as a radical scavenger to prevent hydrothermal degradation of the IIL. The IIL-based PEMWE system operates for more than 500 hours with lower polarization compared to state-of-the-art hydrocarbon-based and Nafion-based PEMWE systems, marking an important milestone for cost-effective PEMWE system development.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Myeong Je Jang, Seok Hwan Yang, Moon Gyu Park, Jaehoon Jeong, Min Suc Cha, Sang-Hun Shin, Kyu Hwan Lee, Zhengyu Bai, Zhongwei Chen, Jang Yong Lee, Sung Mook Choi
Summary: A low-cost anion exchange membrane water electrolysis stack with good performance and durability is demonstrated in this study. By optimizing the configuration and materials of the single cell, high energy conversion efficiency and durability have been achieved, which shows potential for future applications.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
Jonghyun Hyun, Seok Hwan Yang, Gisu Doo, Sungyu Choi, Dong-Hyun Lee, Dong Wook Lee, Jiyun Kwen, Wonhee Jo, Sang-Hun Shin, Jang Yong Lee, Hee-Tak Kim
Summary: This study systematically investigated the degradation of an ionomer-based MEA at the single-cell level and found that the catalyst and ionomer in the cathode exhibited significant degradation, while the membrane was relatively durable. By using an alkaline-stable ionomer in the cathode catalyst layer, an 87% durability improvement was achieved, providing practical strategies for higher durability in AEMFCs.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Multidisciplinary
Seonwoo Hwang, Yecheol Rho, Seog-Jin Jeon, Tae-Ho Kim, Jang Yong Lee, Young Taik Hong, Soonyong So
ACS APPLIED POLYMER MATERIALS
(2019)