Huang Research Group is moving to

Unversity of North Carolina-Chapel Hill.

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Our current research focuses on achieving high performance, low cost thin film electronic materials and devices including Perovskite Solar Cells,, Photodetectors, Radiation detectors, and X-ray Imagers.

 

Highlight of Recent Publications:


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Low-Temperature Fabrication of Efficient Wide-Bandgap Organolead Trihalide Perovskite Solar Cells

Cheng Bi , Yongbo Yuan , Yanjun Fang , and Jinsong Huang*, Advanced Energy Materials

"An efficiency of 13.1%, which is the highest reported efficiency for wide-bandgap perovskite solar cells to the best of our knowledge, was achieved by carefully tuning the thickness, morphology, and surface passivation of the perovskite layers. These fabrication techniques and conditions are compatible with the bottom silicon cells for future tandem cell application."
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High-Gain and Low-Driving-Voltage Photodetectors Based on Organolead Triiodide Perovskites

Rui Dong, Yanjun Fang, Jungseok Chae, Jun Dai, Zhengguo Xiao, Qingfeng Dong,Yongbo Yuan, Andrea Centrone,Xiao Cheng Zeng , Jinsong Huang*. ,Advanced Materials, (R.D and Y. F contributed equally to this work)27, 1912-1918 (2015)

"Benefitting from the trapped-hole-induced electron injection, the CH3NH3PbI3 photodetector works as a photodiode in the dark and shows large photoconductive gain under illumination. The maximum device gain reached 489 ± 6 at a very low driving voltage of -1 V."
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Giant Switchable Photovoltaic Effect in Organometal Trihalide Perovskite Devices

Zhengguo Xiao, Yongbo Yuan, Yuchuan Shao, Qi Wang,Qingfeng Dong, Cheng Bi, Pankaj Sharma, Alexei Gruverman,and Jinsong Huang*. Nature Materials, 14, 193-198 (2015) (Z.X, Y.Y and Y.S contributed to this work equally) (2015)

Here, we show that, in OTP-based photovoltaic devices with vertical and lateral cell configurations, the photocurrent direction can be switched repeatedly by applying a small electric field of <1 Vµm-1.
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Origin and Elimination of Photocurrent Hysteresis by Fullerene Passivation in CH3NH3PbI3 Planar Heterojunction Solar Cells

Yuchuan Shao, Zhengguo Xiao, Cheng Bi, Yongbo Yuan, and Jinsong Huang *. Nature Communications, 5, 5784(2014)

Fullerenes deposited onmthe top of the perovskites reduce the trap density by two orders of magnitude and double the power conversion efficiency of CH3NH3PbI3 solar cells. The elucidation of the origin of photocurrent hysteresis and its elimination by trap passivation in perovskite solar cells provides important directions for future enhancements to device efficiency
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Ultra-high-mobility Transparent Organic Thin Film Transistors Grown by an Off-centre spin-coating Method

Yongbo Yuan, Gaurav Giri, Alexander Ayzner, Arjan Pieter Zoombelt, Stefan C. B. Mannsfeld, Jihua Chen, Jinsong Huang*, and Zhenan Bao*, Nature Communications, 5, 3005 (2014) .

"The resulting transistors show high transparency of >90% over the visible spectrum, indicating their potential for transparent, high-performance organic electronics."
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Electron-hole diffusion lengths >175 micrometer in solution grown CH3NH3PbI3 single crystals

Qingfeng Dong, Yanjun Fang, Yuchuan Shao, Padhraic Mulligan, Jie Qiu, Lei Cao, and Jinsong Huang*. Science, Vol. 347 no. 6225 pp. 967-970 (2015) (Q. D, Y. F and Y.S contributed to this work equally)

"These long diffusion lengths result from greater carrier mobility, longer lifetime, and much smaller trap densities in the single crystals than in polycrystalline thin films."
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A nanocomposite ultraviolet photodetector enabled by interfacial trap-controlled charge injection

Fawen Guo, Bin Yang, Yongbo Yuan, Zhengguo Xiao, Qingfeng Dong, Yu Bi, and Jinsong Huang*, Nature Nanotechnology, 7, 798-802, (2012)

"Here, we show that a solution-processed ultraviolet photodetector with a nanocomposite active layer composed of ZnO nanoparticles blended with semiconducting polymers can significantly outperform inorganic photodetectors"
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Tuning the Energy Level Offset between Donor and Acceptor with Ferroelectric Dipole Layers for Increased Efficiency in Bilayer Organic Photovoltaic Cells

Bin Yang, Yongbo Yuan, Pankaj Sharma, Shashi Poddar, Rafal Korlacki, Stephen Ducharme, Alexei Gruverman, Ravi Saraf, Jinsong Huang, Advanced Materials, 24,1455 (2012)

A general method is reported to increase the power conversion effieciency of polymer solar cells without changing their chemical structures of the light absorbing molecules: a tunable dipole layer was inserted between donor and acceptor layer to tune their lowest unoccupied molecular orbital (LUMO) offset without interrupt the carrier conduction, and then to increase open circuit voltage.
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Air Stable, Photosensitive, Phase Pure Iron Pyrite Nanocrystal Thin Films for Photovoltaic Application

Y. Bi, Y. Yuan, C. L. Exstrom, S. A. Darveau, and J. Huang, Nano Lett.. 11, 4953 (2011)

We report the rational synthesis of phase pure, highly crystalline cubic FeS2 nanocrystals (NCs) using a trioctylphosphine oxide (TOPO) assisted hot-injection method. The synthesized pyrite NC films have excellent air stability over one year. In contrast, obvious surface decomposition was observed on the surface of FeS2 NCs synthesized without TOPO.
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Efficiency enhancement in organic solar cells with ferroelectric polymers

Yongbo Yuan, Timothy J. Reece, Pankaj Sharma, Shashi Poddar, Stephen Ducharme, Alexei Gruverman, Yang Yang and Jinsong Huang, Nature Materials, 10, 296 (2011)

One of the key loss mechanisms in the operation of organic solar cells is the separation and extraction of the generated charge carriers from the active region. The use of a ferroelectric layer is now shown to create large internal electric fields, resulting in an enhanced carrier extraction and increased device efficiency.
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Room-temperature organic ferromagnetism in the crystalline poly(3-hexylthiophene): Phenyl-C61-butyric acid methyl ester blend film

Bin Yang, Zhengguo Xiao, Yongbo Yuan, Tanjore V. Jayaraman, Jeffrey E. Shield, Ralph Skomski and Jinsong Huang, Polymer, 54, 490-494 (2013)

We recently discovered that polymer semiconductors, such as poly(3-hexylthiophene)(P3HT), can have room temperature (RT) ferromagnetic properties in their crystalline phase and when mixed with phenyl-C61-butyric acid methyl ester (PCBM). Tens to hundreds nm size domains are clearly observed by magnetic force microscopy (MFM), and the ferromagnet was confirmed by superconducting quantum interference devices (SQUID).
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