Ms. Yuan Xiong Profile

Yuan Xiong

at North Carolina State Univ

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Publications (5)

Proceedings Article | 20 August 2020 Poster

An all-solution-processed interconnecting layer for highly reproducible and efficient tandem organic solar cells

Carr Ho, Taesoo Kim, Yuan Xiong, Yuliar Firdaus, Shuo Ding, Aram Amassian, Harald Ade, Thomas Anthopoulos, Franky So

Proceedings Volume 11474, 114741M (2020) https://doi.org/10.1117/12.2568564

KEYWORDS: Organic photovoltaics, Solar cells, Tandem solar cells, Absorption, Organic semiconductors, Light harvesting, Aluminum, Polymers, Device simulation

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Proceedings Article | 20 August 2020 Presentation

ITO-free fully solution-processed flexible semi-transparent organic photovoltaics utilizing metal nanowire for anode and cathode

Ronald Booth, Brendan O'Connor, Yuan Xiong, Harald Ade, Yuxuan Liu, Yong Zhu

Proceedings Volume 11474, 1147410 (2020) https://doi.org/10.1117/12.2570470

KEYWORDS: Metals, Electrodes, Organic photovoltaics, Nanowires, Solar energy, Indium, Tin, Oxides, Opacity, Silver

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Proceedings Article | 10 September 2019 Presentation

Sequential deposition of organic films with eco-compatible solvents enables high-efficiency nonfullerene solar cells (Conference Presentation)

Long Ye, Yuan Xiong, Reece Henry, Brendan O'Connor, Harald Ade, Wei You, Zheng Chen, Qianqian Zhang

Proceedings Volume 11094, 110940O (2019) https://doi.org/10.1117/12.2529802

KEYWORDS: Solar cells, Polymers, Polymer thin films, Thin film devices, Organic photovoltaics, Molecules, Crystals, Instrument modeling, Performance modeling, X-rays

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Casting of a donor:acceptor bulk-heterojunction structure from a single ink has been the predominant fabrication method of solution-processed organic photovoltaics (OPVs). Despite the success of such bulk-heterojunction, the task of controlling its microstructure in a single casting process has been challenging and arduous and alternative approaches are desired. To achieve and even improve OPVs with a desirable microstructure, a facile and eco-compatible sequential deposition approach is demonstrated for nonfullerene polymer/small molecule pairs. Using a known weakly crystalline polymer FTAZ as the model material, we show the profound influence of casting solvent on the molecular ordering of the film, and thus the device performance and mesoscale morphology of sequentially deposited OPVs can be tuned[1]. Static and in-situ X-ray scattering indicate that applying the green solvent limonene is able to greatly promote the molecular order of FTAZ and form the largest domain spacing exclusively, which correlate well with the best efficiency in sequentially deposited devices. The sequentially cast device generally outperforms its control device[2] based on traditional single-ink bulk-heterojunction structure. Investigations of distinct material systems suggest that our approach be applicable to many conjugated polymers and nonfullerene acceptors, which yield consistently higher fill factors than traditional bulk-heterojunction devices. Moreover, the relationships between polymer:solvent interactions, thin-film microstructure, and device performance are discussed for these sequentially deposited devices. It is noted that polymer:solvent interaction parameter χ positively correlates with domain spacing in the devices. Our findings shed light on innovative approaches to rationally create ink-stable, environmentally friendly, and highly efficient nonfullerene solar cells. Reference [1] Ye, L.; Xiong, Y.; Chen, Z.; Zhang, Q.; Fei, Z.; Henry, R.; Heeney, M.; O’Connor, B.; You, W.; Ade, H. Adv. Mater. 2019, under review. [2] Ye, L.; Xiong, Y.; Zhang, Q.; Li, S.; Wang, C.; Jiang, Z.; Hou, J.; You, W.; Ade, H. Adv. Mater. 2018, DOI: 10.1002/adma.201705485.

Proceedings Article | 10 September 2019 Presentation

Semi-transparent organic solar cells for greenhouse application (Conference Presentation)

Yuan Xiong, Harald Ade, Brendan O'Connor, Carole Saravitz, Heike Sederoff, Wei You, Eshwar Ravishankar, Jennifer Swift, Ronald Booth, Melodi Charles, Reece Henry, Jeromy Rech, Long Ye

Proceedings Volume 11094, 110940N (2019) https://doi.org/10.1117/12.2529997

KEYWORDS: Organic photovoltaics, Solar cells, Botany, Physics, Carbon, Electronics, Aerospace engineering, Biology, Chemistry, Photovoltaics

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Semi-transparent Organic Solar Cells for Greenhouse Application Yuan Xiong1*, Eshwar Ravishankar2, Jennifer Swift3, Harald Ade1*, Ronald Booth2, Melodi Charles4, Reece Henry1, Brendan O’Connor2, Jeromy James Rech5, Carole Saravitz3, Heike Sederoff4, Long Ye1, Wei You5 1. Department of Physics, Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University, Raleigh, NC 27695, USA 2. Department of Mechanical and Aerospace Engineering and ORaCEL, North Carolina State University, Raleigh, NC 27695, USA 3. Department of Plant Biology, North Carolina State University, Raleigh, NC 27695, USA 4. Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC 27695, USA 5. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA E-mail: yxiong8@ncsu.edu; hwade@ncsu.edu Semitransparent organic solar cells (ST-OSCs) show great potential in building-integrated photovoltaics due to the advantages in solution processability, flexibility, and transparency. Herein, we present a systematic study on the application of high-performance ST-OSC filters in a greenhouse by utilizing three representative systems with different spectral responses, namely, FTAZ:PC71BM[1], FTAZ:IT-M[2, 3], and PTB7-Th:IEICO-4F[4]. Specifically, the cultivation of red leaf lettuce is conducted in a controlled environment growth chamber, which is possible to duplicate any climate, and under different ST-OSC filters. In principle, the ST-OSCs absorb a portion of the solar spectrum for power generation and lettuce utilizes the penetrated light for photosynthesis. Furthermore, we quantitatively investigate the leaf area and number profiles, plant biomass, and photosynthetic rate under the as-prepared ST-OSC filters treatments. On the base of statistical analysis after the growth cycle, we can identify the best ST-OSC for plant growth. These results thus pave the way to integrate ST-OSCs with greenhouses. [1] S. C. Price, A. C. Stuart, L. Yang, H. Zhou, W. You, Journal of the American Chemical Society 2011, 133, 4625. [2] L. Ye, Y. Xiong, Q. Zhang, S. Li, C. Wang, Z. Jiang, J. Hou, W. You, H. Ade, Advanced Materials 2018, 30, 1705485. [3] Y. Xiong, L. Ye, A. Gadisa, Q. Zhang, J. J. Rech, W. You, H. Ade, Advanced Functional Materials 2019, 29, 1806262. [4] X. Song, N. Gasparini, L. Ye, H. Yao, J. Hou, H. Ade, D. Baran, ACS Energy Letters 2018, 3, 669.

Proceedings Article | 19 September 2017 Presentation

Over 11%-efficiency fullerene-free organic solar cells enabled by benign solvents (Conference Presentation)

Long Ye, Wenchao Zhao, Masoud Ghasemi, Yuan Xiong, Jianhui Hou, Harald Ade

Proceedings Volume 10363, 103630X (2017) https://doi.org/10.1117/12.2276043

KEYWORDS: Solar cells, Organic photovoltaics, Polymers, Lithium, X-rays, Scattering, Printing, Photovoltaics, Coating, Solar energy

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Owing to the recently developed nonfullerene small molecule acceptors, the best power conversion efficiency (PCE) of solution-processable organic solar cells (OSCs) has been boosted up to over 12%[1], which makes this technology an economically viable contender for commercialization. Along with the steady progress in PCE achieved by spin-coating photovoltaic materials with chlorinated solvents in protective atmosphere, a central issue in the development of OSCs is pursuing a greener and simpler manufacturing protocol[2], which particularly allows for large-area processing in ambient air. Particularly, it is still a great challenge to replace halogenated solvents with halogen-free, low-toxicity solvents to achieve high-efficiency nonfullerene OSCs. Here we show that ~11.6% efficiency is achieved in nonfullerene OSC device based on PBDB-T:IT-M[3] by using a non-halogenated solvent combination. Moreover, the device parameters were correlated to the morphology investigated by synchrotron radiation grazing-incidence wide-angle X-ray scattering (GIWAXS), resonant soft X-ray scattering (R-SoXS), and differential scanning calorimetry (DSC). We observed a monotonic correlation between the average composition variations and photovoltaic device characteristics across all processing protocols in this record-efficiency material system. This correlation is indeed universal for OSC, irrespective of acceptor materials used (fullerenes, nonfullerene molecular acceptor, or conjugated polymers) and fabrication methods used (spin-coating or blade-coating).[1-5] We believe this nonhazardous solvent approach will be also applicable in the large area roll-to-roll coating and industrial scale printing of high-efficiency OSCs in air. Reference [1] Li, S.; Ye, L.; Zhao, W.; Zhang, S.; Mukherjee, S.; Ade, H.; Hou, J., Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells. Adv. Mater. 2016, 28 (42), 9423-9429. [2] Ye, L.; Xiong, Y.; Yao, H.; Gadisa, A.; Zhang, H.; Li, S.; Ghasemi, M.; Balar, N.; Hunt, A.; O’Connor, B. T.; Hou, J.; Ade, H., High Performance Organic Solar Cells Processed by Blade Coating in Air from a Benign Food Additive Solution. Chem. Mater. 2016, 28 (20), 7451-7458. [3] Ye, L.; Zhao, W.; Li, S.; Mukherjee, S.; Carpenter, J. H.; Awartani, O.; Jiao, X.; Hou, J.; Ade, H., High-Efficiency Nonfullerene Organic Solar Cells: Critical Factors that Affect Complex Multi-length Scale Morphology and Device Performance. Adv. Energy Mater. 2017, 7, 1602000. [4] Ye, L.; Jiao, X.; Zhang, S.; Yao, H.; Qin, Y.; Ade, H.; Hou, J., Control of Mesoscale Morphology and Photovoltaic Performance in Diketopyrrolopyrrole-Based Small Band Gap Terpolymers. Adv. Energy Mater. 2017, 7, 1601138. [5] Ye, L.; Jiao, X.; Zhao, W.; Zhang, S.; Yao, H.; Li, S.; Ade, H.; Hou, J., Manipulation of Domain Purity and Orientational Ordering in High Performance All-Polymer Solar Cells. Chem. Mater. 2016, 28 (17), 6178-6185.

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