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Start Over Author "Huiliang Sun" Journal advanced science
3 results on '"Huiliang Sun"'

1. A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open‐Circuit Voltage

Author

Yumin Tang, Huiliang Sun, Ziang Wu, Yujie Zhang, Guangye Zhang, Mengyao Su, Xin Zhou, Xia Wu, Weipeng Sun, Xianhe Zhang, Bin Liu, Wei Chen, Qiaogan Liao, Han Young Woo, and Xugang Guo

Subjects
complementary absorption, donor polymers, nonfullerene organic solar cells, nonhalogenated solvents, wide bandgap, Science
Abstract

Abstract Significant progress has been made in nonfullerene small molecule acceptors (NF‐SMAs) that leads to a consistent increase of power conversion efficiency (PCE) of nonfullerene organic solar cells (NF‐OSCs). To achieve better compatibility with high‐performance NF‐SMAs, the direction of molecular design for donor polymers is toward wide bandgap (WBG), tailored properties, and preferentially ecofriendly processability for device fabrication. Here, a weak acceptor unit, methyl 2,5‐dibromo‐4‐fluorothiophene‐3‐carboxylate (FE‐T), is synthesized and copolymerized with benzo[1,2‐b:4,5‐b′]dithiophene (BDT) to afford a series of nonhalogenated solvent processable WBG polymers P1‐P3 with a distinct side chain on FE‐T. The incorporation of FE‐T leads to polymers with a deep highest occupied molecular orbital (HOMO) level of −5.60−5.70 eV, a complementary absorption to NF‐SMAs, and a planar molecular conformation. When combined with the narrow bandgap acceptor ITIC‐Th, the solar cell based on P1 with the shortest methyl chain on FE‐T achieves a PCE of 11.39% with a large Voc of 1.01 V and a Jsc of 17.89 mA cm−2. Moreover, a PCE of 12.11% is attained for ternary cells based on WBG P1, narrow bandgap PTB7‐Th, and acceptor IEICO‐4F. These results demonstrate that the new FE‐T is a highly promising acceptor unit to construct WBG polymers for efficient NF‐OSCs.

Published
2019
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2. Polymer Semiconductors: Phthalimide‐Based High Mobility Polymer Semiconductors for Efficient Nonfullerene Solar Cells with Power Conversion Efficiencies over 13% (Adv. Sci. 2/2019)

Author

Qiaogan Liao, Kun Yang, Bin Liu, Peng Chen, Xin Zhou, Chang Woo Koh, Xugang Guo, Shiming Zhang, Jianhua Chen, Jianwei Yu, Huiliang Sun, Han Young Woo, and Hang Wang

Subjects
high power conversion efficiencies, nonfullerene polymer solar cells, Materials science, business.industry, General Chemical Engineering, Inside Back Cover, difluorobenzothiadiazole, General Engineering, General Physics and Astronomy, Medicine (miscellaneous), Polymer semiconductor, Biochemistry, Genetics and Molecular Biology (miscellaneous), high mobility polymers, Power (physics), Phthalimide, chemistry.chemical_compound, chemistry, Optoelectronics, General Materials Science, business, phthalimide
Abstract

In article number 1801743, Xugang Guo and co‐workers develop two phthalimide‐based polymers featuring a D‐A1‐D‐A2 backbone motif. Eliminating benzodithiophene leads to polymers with substantial mobility. Nonfullerene polymer solar cells utilizing these high‐mobility polymers achieve a remarkable power conversion efficiency >13%. The results demonstrate that phthalimides are excellent building blocks for enabling polymer semiconductors with outstanding solar cell performances and benzodithiophenes are not necessary for constructing such polymers.

Published
2019

3. Phthalimide‐Based High Mobility Polymer Semiconductors for Efficient Nonfullerene Solar Cells with Power Conversion Efficiencies over 13%

Author

Chang Woo Koh, Huiliang Sun, Han Young Woo, Peng Chen, Qiaogan Liao, Xin Zhou, Jianwei Yu, Xugang Guo, Kun Yang, Hang Wang, Bin Liu, Jianhua Chen, and Shiming Zhang

Subjects
high power conversion efficiencies, Materials science, Band gap, General Chemical Engineering, General Physics and Astronomy, Medicine (miscellaneous), 02 engineering and technology, 010402 general chemistry, Photochemistry, high mobility polymers, 01 natural sciences, Biochemistry, Genetics and Molecular Biology (miscellaneous), Polymer solar cell, Phthalimide, chemistry.chemical_compound, General Materials Science, Absorption (electromagnetic radiation), HOMO/LUMO, Phthalimides, chemistry.chemical_classification, nonfullerene polymer solar cells, Full Paper, difluorobenzothiadiazole, General Engineering, Polymer, Full Papers, 021001 nanoscience & nanotechnology, Acceptor, 0104 chemical sciences, chemistry, 0210 nano-technology, phthalimide
Abstract

Highly efficient nonfullerene polymer solar cells (PSCs) are developed based on two new phthalimide‐based polymers phthalimide‐difluorobenzothiadiazole (PhI‐ffBT) and fluorinated phthalimide‐ffBT (ffPhI‐ffBT). Compared to all high‐performance polymers reported, which are exclusively based on benzo[1,2‐b:4,5‐b′]dithiophene (BDT), both PhI‐ffBT and ffPhI‐ffBT are BDT‐free and feature a D‐A1‐D‐A2 type backbone. Incorporating a second acceptor unit difluorobenzothiadiazole leads to polymers with low‐lying highest occupied molecular orbital levels (≈−5.6 eV) and a complementary absorption with the narrow bandgap nonfullerene acceptor IT‐4F. Moreover, these BDT‐free polymers show substantially higher hole mobilities than BDT‐based polymers, which are beneficial to charge transport and extraction in solar cells. The PSCs containing difluorinated phthalimide‐based polymer ffPhI‐ffBT achieve a substantial PCE of 12.74% and a large V oc of 0.94 V, and the PSCs containing phthalimide‐based polymer PhI‐ffBT show a further increased PCE of 13.31% with a higher J sc of 19.41 mA cm−2 and a larger fill factor of 0.76. The 13.31% PCE is the highest value except the widely studied BDT‐based polymers and is also the highest among all benzothiadiazole‐based polymers. The results demonstrate that phthalimides are excellent building blocks for enabling donor polymers with the state‐of‐the‐art performance in nonfullerene PSCs and the BDT is not necessary for constructing such donor polymers.

Published
2018
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