Article
Energy & Fuels
Matthew Bates, Carson Malhado, Chenchen Yang, Christopher K. K. Herrera, Richard R. R. Lunt
Summary: Transparent and semitransparent photovoltaics, enabled by organic photovoltaics (OPVs), offer a promising way to integrate renewable energy into existing infrastructure. The recent development of nonfullerene acceptors (NFAs) has accelerated the rise of OPVs and transparent photovoltaics (TPVs). In this study, a sequential layer-by-layer (LBL) deposition technique is used to create a selectively NIR absorbing nontraditional acceptor polymer paired with a NIR absorbing donor IEICO-4F. The optimized device demonstrates a PCE of 8.8%, AVT of 40.9%, and a light utilization efficiency of 3.6%.
Review
Chemistry, Physical
Wei Song, Jinfeng Ge, Lin Xie, Zhenyu Chen, Qinrui Ye, Dinghong Sun, Jingyu Shi, Xinyu Tong, Xiaoli Zhang, Ziyi Ge
Summary: This paper provides an overview of the opportunities and advantages of organic photovoltaics (OPV) in the field of agrivoltaics, as well as an assessment of its economic viability. It also discusses the challenges of implementing OPV in agrivoltaic systems, including OPV technology, agronomic management, and crop selection.
Article
Physics, Applied
Hafiz K. M. Sheriff, Yongxi Li, Boning Qu, Stephen R. Forrest
Summary: In this study, optical coatings were utilized to design semi-transparent organic photovoltaics with neutral visible transmittance, high power conversion efficiency, and optical properties independent of variations in solar angle of incidence. The coatings were rapidly designed using a genetic algorithm and transfer matrix formalism, demonstrating the potential for efficient and versatile power generating applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Energy & Fuels
A. Moreno, A. Riverola, D. Chemisana, R. Vaillon, A. Solans
Summary: Architectural glazing has advantages in aesthetics and user well-being, but can impact heating, cooling, and lighting. Ethylene tetrafluoroethylene (ETFE) cushion systems with organic photovoltaic (OPV) modules offer energy efficient glazing. This study provides a detailed analysis of an ETFE/OPV cushion, aiding in the design and understanding of performance.
Article
Energy & Fuels
Jessica Barichello, Diego Di Girolamo, Elisa Nonni, Barbara Paci, Amanda Generosi, Minjin Kim, Alexandra Levtchenko, Stefania Cacovich, Aldo Di Carlo, Fabio Matteocci
Summary: Perovskite photovoltaics is an emerging PV technology with tunable bandgap and high visible transmittance. However, research on this topic is still in its early stages, mainly focusing on achieving uniform coverage and morphology control. In this study, a blade coating technique was used to fabricate semi-transparent perovskite solar cells based on FAPbBr(3), showing promising PV performances at low temperature and in the air environment. The results demonstrate the potential of perovskite for building integrated photovoltaics.
Article
Chemistry, Physical
Yaokai Li, Chengliang He, Lijian Zuo, Feng Zhao, Lingling Zhan, Xin Li, Ruoxi Xia, Hin-Lap Yip, Chang-Zhi Li, Xu Liu, Hongzheng Chen
Summary: This study demonstrates the importance of manipulating the optical properties of materials to improve the light-absorbing selectivity of semi-transparent organic photovoltaics (ST-OPVs), resulting in high-efficiency ST-OPVs with improved light utilization efficiency and good color rendering index.
ADVANCED ENERGY MATERIALS
(2021)
Article
Construction & Building Technology
Sankar Barman, Amartya Chowdhury, Sanjay Mathur, Jyotirmay Mathur
Summary: This study assessed the angular loss of a semi-transparent photovoltaic module used in a vertical window system, finding that angular loss can be as high as 8.7% at the considered latitude and becomes prominent for an angle of incidence above 70 degrees. It was also discovered that with STPV module transparency, the angular loss can vary by around 25%.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Philip Bellchambers, Charlie Henderson, Szymon Abrahamczyk, Seungsoo Choi, Jin-Kyun Lee, Ross A. Hatton
Summary: Silver grid electrodes on glass and flexible plastic substrates are introduced as a drop-in replacement for ITO glass in organic photovoltaics (OPVs), surpassing the performance of commercial ITO coated glass. These electrodes demonstrate stability during repetitive bending on flexible plastic substrates and are fabricated using an unconventional approach of condensation coefficient modulation with a superior perfluorinated polymer. The narrow line width and small grid pitch achieved also allow the possibility of using grid electrodes in OPVs without a conducting PEDOT: PSS layer.
ADVANCED MATERIALS
(2023)
Review
Energy & Fuels
Zhenpeng Li, Tao Ma, Hongxing Yang, Lin Lu, Ruzhu Wang
Summary: Building-integrated photovoltaics (BIPVs) offer a promising solution for providing renewable electricity for achieving zero-energy buildings, but are hindered from large-scale implementations due to the difficulty of traditional photovoltaic modules in meeting the standards and aesthetics of architectural materials. The emergence of new photovoltaic materials and devices could pave the way for the future by offering diversity in colors and transparency along with comparable performance.
Article
Chemistry, Physical
Dandan Chen, Yanshuang Ba, Minyu Deng, Weidong Zhu, Wenming Chai, He Xi, Dazheng Chen, Jincheng Zhang, Chunfu Zhang, Yue Hao
Summary: The study presents a water-assisted two-step spin coating growth strategy for preparing CsPbCl3 films, demonstrating the feasibility of achieving desired film properties and showing potential applications in photovoltaic technology.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Yongbin Jin, Huiping Feng, Zheng Fang, Liu Yang, Kaikai Liu, Bingru Deng, Jingfu Chen, Xueling Chen, Yawen Zhong, Jinxin Yang, Chengbo Tian, Liqiang Xie, Zhanhua Wei
Summary: In this study, a p-conjugated polymer PBDB-T is used to improve the stability of semi-transparent perovskite solar cells (ST-PSCs). The incorporation of the polymer forms a polymer composite hole transport layer (HTL) with Spiro-OMeTAD, enhancing the stability of the perovskite/HTL interface and passivating the interfacial defects. The ST-PSCs achieved a champion efficiency of 13.71% and an average visible light transmittance of 36.04%, resulting in a high light utilization efficiency of 4.94%. The encapsulated device maintained 84% of the initial efficiency after 751 hours of continuous one-sun illumination, while the unencapsulated device maintained 80% of the initial efficiency after more than 1250 hours of continuous one-sun illumination.
Article
Agronomy
Rebekah Waller, Murat Kacira, Esther Magadley, Meir Teitel, Ibrahim Yehia
Summary: The study demonstrated the feasibility of using flexible, roll-to-roll printed, semi-transparent OPV arrays as a roof shade for greenhouse hydroponic tomato production in arid southwestern U.S. Although fruit development and ripening were delayed in the OPV-shaded area, the total yields and fruit mass were not significantly different from the Control section.
Article
Chemistry, Physical
Fabio Matteocci, Daniele Rossi, Luigi Angelo Castriotta, Daniel Ory, Salim Mejaouri, Matthias Auf der Maur, Frederic Sauvage, Stefania Cacovich, Aldo Di Carlo
Summary: The interest in Building Integrated Photovoltaic (BIPV) is growing worldwide. Semi-transparent perovskite solar cells have excellent potential in terms of both Average Visible Transmittance (AVT) and color neutrality, making them ideal for the development of PV windows. Through a combination of theoretical and experimental results, efficient and highly semi-transparent perovskite solar modules have been successfully fabricated, achieving a champion device efficiency of 6.3 %, Average Visible Transmittance of 69.4 %, and Light Utilization Efficiency of 4.37 %.
Article
Green & Sustainable Science & Technology
Shiva Gorjian, Erion Bousi, Oezal Emre Oezdemir, Max Trommsdorff, Nallapaneni Manoj Kumar, Abhishek Anand, Karunesh Kant, Shauhrat S. Chopra
Summary: The world population is growing and so is the demand for food. To cope with climate change and global warming, areas are being used to generate clean electricity. The combination of crop production and solar photovoltaics in agrivoltaic technology offers a resource-efficient solution to the competition for arable lands. The implementation of agrivoltaic systems has increased exponentially in recent years, with c-Si STPV modules being the most commonly employed technology.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Review
Chemistry, Multidisciplinary
Hailin Yu, Jiayu Wang, Qiao Zhou, Jiaqiang Qin, Yinghan Wang, Xinhui Lu, Pei Cheng
Summary: Organic photovoltaics (OPVs) are considered as a promising solution to environmental problems and energy challenges. Semi-transparent OPVs (STOPVs) are one of the most possible commercialized forms of OPVs, with power conversion efficiency over 14% and average visible light transmittance over 20%. This tutorial review summarizes the device structures, operating principles, and evaluation parameters of STOPVs, proposes strategies to construct high-performance STOPVs, and discusses potential applications and challenges for the future commercialization of STOPVs.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Analytical
Juhyeon Kim, Srinivasa Cheekati, Tuba Sarwar, Pei-Cheng Ku
Summary: This paper proposes a spectrometer design enabling an ultrathin form factor, integrating a large number of photodetectors exhibiting different absorption cut-off wavelengths on the chip. The introduction of a simple cone-shaped back-reflector enables a high light-harvesting efficiency design and improves the accuracy of spectral reconstruction. A light-harvesting efficiency as high as 60% was achieved with five InGaN/GaN multiple quantum wells for the visible wavelengths.
Article
Physics, Applied
Juhyeon Kim, Donato Mastropietro, Duncan Steel, Jung-Tsung Shen, Pei-Cheng Ku
Summary: A novel semiconductor chip is proposed for generating photonic dimers, a quantum photonic state, and a measurement scheme to validate their existence is discussed. The design utilizes InAs epitaxial quantum dot structures coupled to weak laser pulses via a chiral nanophotonic waveguide, with the performance analyzed as a function of quantum dot misalignment. It is expected that excitation efficiency greater than 50% can still be achieved as long as the quantum dot is positioned in the lower half of the chiral waveguide.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Nathan Dvorak, Kunook Chung, Kobie Mueller, Pei-Cheng Ku
Summary: An ultrathin tactile sensor with directional sensitivity, utilizing GaN nanopillar LEDs, demonstrates high spatial resolution mapping. The sensor array exhibits two-dimensional directional sensitivity with a dynamic range of 1-30 mN and an accuracy of +/-1.3 mN. The sensor successfully tracks and maps external force movements, while also registering fingertip movements and fingerprint patterns.
Editorial Material
Automation & Control Systems
Chun Sing Lai, Thomas I. Strasser, Loi Lei Lai
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2022)
Article
Chemistry, Analytical
Tuba Sarwar, Pei-Cheng Ku
Summary: A semiconductor spectrometer chip with a monolithically integrated light-emitting diode was demonstrated. The chip eliminates the need for external optics to control the incident angle of light and features a computational reconstruction algorithm and absorptive spectral filters. The chip's functionality was validated through experimental proof of concept, showing successful operation of the LED excitation light source and photodetectors.
Article
Nanoscience & Nanotechnology
Juhyeon Kim, Zachary Croft, Duncan G. Steel, Pei-Cheng Ku
Summary: This paper analyzes two laterally positioned quantum dot single-photon emitters in different semiconductor heterostructures. A controlled phase gate between two quantum dot spins based on Coulomb interaction is demonstrated. Increasing the bitrion coupling and spacing between the quantum dots improves the gate fidelity. The study also shows an enhanced bitrion coupling in In(Ga)N quantum dots.
Article
Chemistry, Multidisciplinary
Tuba Sarwar, Can Yaras, Xiang Li, Qing Qu, Pei-Cheng Ku
Summary: This study demonstrated a wafer-thin chip-scale portable spectrometer based on a reconstructive algorithm, suitable for wearable applications. By applying local strain engineering in InGaN/GaN multiple quantum well heterostructures, 16 spectral encoders were successfully monolithically integrated on a chip area of 0.16 mm2. The use of a non-negative least-squares algorithm achieved decent spectral reconstruction performance in the wavelength range of 400-645 nm.
Article
Chemistry, Analytical
Nathan Dvorak, Nima Fazeli, Pei-Cheng Ku
Summary: An experiment was conducted to calibrate a tactile sensor based on GaN nanopillars, which can measure the absolute magnitude and direction of applied shear force without requiring any data post-processing. The sensor's calibration utilized a commercial force/torque sensor, and numerical simulations were employed to convert the readings of the force/torque sensor into shear force applied on each nanopillar's tip. The results demonstrated the direct measurement of shear stress ranging from 3.71 to 50 kPa, which is important for various robotic tasks.
Article
Engineering, Electrical & Electronic
Nathan A. Dvorak, Pei-Cheng Ku
Summary: An electrically driven shear stress tactile sensor has been experimentally demonstrated. The sensor design incorporates a ultrathin platinum Ohmic contact conformally coated around elastic nanopillar structures by atomic layer deposition. The intensity of emitted light from InGaN is reduced when the nanopillar structures deform upon the application of an external shear force, allowing for direct measurement of the magnitude and direction of the force.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Physics, Nuclear
E. Cline, W. Lin, P. Roy, P. E. Reimer, K. E. Mesick, A. Akmal, A. Alie, H. Atac, A. Atencio, C. Ayerbe Gayoso, N. Benmouna, F. Benmokhtar, J. C. Bernauer, W. J. Briscoe, J. Campbell, D. Cohen, E. O. Cohen, C. Collicott, K. Deiters, S. Dogra, E. Downie, I. P. Fernando, A. Flannery, T. Gautam, D. Ghosal, R. Gilman, A. Golossanov, B. F. Halter, J. Hirschman, Y. Ilieva, M. Kim, M. Kohl, B. Krusche, I Lavrukhin, L. Li, B. Liang-Gilman, A. Liyanage, W. Lorenzon, P. Mohanmurthy, R. Mokal, P. Moran, S. J. Nazeer, P. Or, T. Patel, E. Piasetzky, T. Rauber, R. S. Raymond, D. Reggiani, H. Reid, G. Ron, E. Rooney, T. Rostomyan, M. Schwarz, A. Sneath, P. G. Solazzo, N. Sparveris, N. Steinberg, S. Strauch, V Sulkosky, N. Wuerfel
Summary: The MUon Scattering Experiment (MUSE) conducted at the Paul Scherrer Institute in Switzerland investigates the puzzle of proton charge radius, lepton universality, and two-photon exchange through simultaneous measurements of muon-proton and electron-proton scattering. The study concludes that the PiM1 channel can be used for high precision scattering of pions, muons, and electrons.
Proceedings Paper
Engineering, Electrical & Electronic
Tuba Sarwar, Juhyeon Kim, Srinivasa Cheekati, Pei-Cheng Ku
Summary: This paper presents the design of an optics-free, ultra-thin chip-scale optical spectrometer with monolithically integrated GaN light-emitting diodes suitable for reflectance or fluorescence spectroscopy.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Nathan Dvorak, Kunook Chung, Kobie Mueller, Pei-Cheng Ku
Summary: A new tactile sensor using gallium nitride nanopillar light-emitting diodes is proposed and demonstrated, with sensitivities comparable to the human fingertip, capable of detecting the direction, magnitude, and location of an external shear force accurately.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Juhyeon Kim, Zachary Croft, Duncan Steel, Pei-Cheng Ku
Summary: The study demonstrates that a controlled phase gate can be achieved on two laterally positioned quantum dots using long-range Coulomb coupling, with the permanent dipole moment in piezoelectric quantum dots significantly enhancing the coupling.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Optics
Zihao Chen, Yao Zhou, Jung-Tsung Shen, Pei-Cheng Ku, Duncan Steel
Summary: Photons are attractive for flying quantum bits due to their low noise, long coherence times, and ease of manipulation. However, the challenge lies in realizing two-qubit gates for photonic qubits. So far, only probabilistic optical controlled-phase gates have been demonstrated.
Proceedings Paper
Engineering, Electrical & Electronic
Tuba Sarwar, Srinivasa Cheekati, Kunook Chung, Pei-Cheng Ku
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
