Yang Yang

California NanoSystems Institute

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Gang Li

Hong Kong Polytechnic University

Rui Wang

Westlake University

Jin‐Wook Lee

Sungkyunkwan University

Ziruo Hong

University of California, Los Angeles

Shaun Tan

Massachusetts Institute of Technology

Yepin Zhao

University of California, Los Angeles

Tianyi Huang

Carnegie Mellon University

Jingjing Xue

Zhejiang University

Pei Cheng

Sichuan University

Pengyu Sun

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

Chinese Academy of Sciences

392

University of California, Los Angeles

265

Seascape Consultants (United Kingdom)

264

Caterpillar (United States)

257

University of Chinese Academy of Sciences

200

California NanoSystems Institute

147

Zhejiang University

143

Shanghai Jiao Tong University

105

Peking University

103

Huazhong University of Science and Technology

101

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Recent Progress in Materials and Devices toward Printable and Flexible Sensors

Advanced Materials (2016)

You Seung Rim Sang‐Hoon Bae Huajun Chen Nicholas De Marco Yang Yang

Printable electronics present a new era of wearable electronic technologies. Detailed technologies consisting of novel ink semiconductor materials, flexible substrates, and unique processing methods can be integrated to create flexible sensors. To detect various stimuli of the human body, as well as specific environments, unique electronic devices formed by “ink‐based semiconductors” onto flexible and/or stretchable substrates have become a major research trend in recent years. Materials such as inorganic, organic, and hybrid semiconductors with various structures (i.e., 1D, 2D and 3D) with printing capabilities have been considered for bio and medical applications. In this review, we report recent progress in materials and devices for future wearable sensor technologies.

Wearable Technology

Electronic materials

Flexible Electronics

Stretchable electronics

Organic semiconductor

10.1002/adma.201505118

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Citations (703)

A Review of Perovskites Solar Cell Stability

Advanced Functional Materials (2019)

Rui Wang Muhammad Mujahid Yu Duan Zhao‐Kui Wang Jingjing Xue

Abstract In this review, the factors influencing the power conversion efficiency (PCE) of perovskite solar cells (PSCs) is emphasized. The PCE of PSCs has remarkably increased from 3.8% to 23.7%, but on the other hand, poor stability is one of the main facets that creates a huge barrier in the commercialization of PSCs. Herein, a concise overview of the current efforts to enhance the stability of PSCs is provided; moreover, the degradation causes and mechanisms are summarized. The strategies to improve device stability are portrayed in terms of structural effects, a photoactive layer, hole‐ and electron‐transporting layers, electrode materials, and device encapsulation. Last but not least, the economic feasibility of PSCs is also vividly discussed.

Photoactive layer

Degradation

Perovskite solar cell

10.1002/adfm.201808843

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Citations (1,099)

Planar Heterojunction Perovskite Solar Cells via Vapor-Assisted Solution Process

Journal of the American Chemical Society (2013)

Qi Chen Huanping Zhou Ziruo Hong Song Luo Hsin-Sheng Duan

Hybrid organic/inorganic perovskites (e.g., CH3NH3PbI3) as light absorbers are promising players in the field of third-generation photovoltaics. Here we demonstrate a low-temperature vapor-assisted solution process to construct polycrystalline perovskite thin films with full surface coverage, small surface roughness, and grain size up to microscale. Solar cells based on the as-prepared films achieve high power conversion efficiency of 12.1%, so far the highest efficiency based on CH3NH3PbI3 with the planar heterojunction configuration. This method provides a simple approach to perovskite film preparation and paves the way for high reproducibility of films and devices. The underlying kinetic and thermodynamic parameters regarding the perovskite film growth are discussed as well.

Microscale chemistry

Perovskite solar cell

Solution process

10.1021/ja411509g

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Citations (2,206)

Perovskite solar cells: film formation and properties

Journal of Materials Chemistry A (2015)

Tze‐Bin Song Qi Chen Huanping Zhou Chengyang Jiang Hsin-Hua Wang

Perovskite solar cells have received considerable attention in recent years as a promising material capable of developing high performance photovoltaic devices at a low cost.

10.1039/c4ta05246c

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Citations (430)

Efficient Flexible Inorganic Perovskite Light-Emitting Diodes Fabricated with CsPbBr₃ Emitters Prepared via Low-Temperature in Situ Dynamic Thermal Crystallization

Nano Letters (2020)

Chen Chen Tae Hee Han Shaun Tan Jingjing Xue Yepin Zhao

The present study systematically investigates the morphology and crystallization process of inorganic CsPbBr3 perovskite layer films fabricated by thermal coevaporation in conjunction with continuous low-temperature thermal annealing to promote in situ dynamic thermal crystallization. The results confirm for the first time that both the crystal grain size and the compactness of the CsPbBr3 films can be tuned during the thermal coevaporation fabrication process via in situ dynamic thermal crystallization. The performance of the PeLEDs employing the CsPbBr3 films as the emitter layer is investigated in detail with respect to the substrate temperature and deposition rate employed during deposition of the CsPbBr3 film. This study provides guidelines for developing suitable film production processes and highlights future challenges that must be addressed to facilitate the commercial development of large-area, uniform, and flexible perovskite-based optoelectronic devices.

10.1021/acs.nanolett.0c01550

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Citations (64)

Semiconducting carbon nanotubes as crystal growth templates and grain bridges in perovskite solar cells

Journal of Materials Chemistry A (2019)

Seungju Seo Il Jeon Rong Xiang Changsoo Lee Hao Zhang

Grain size control and boundary passivation of perovskite films are the key to obtaining efficient perovskite solar cells.

Passivation

Template

Carbon fibers

10.1039/c9ta02629k

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Citations (65)

Molecular engineering of side chain architecture of conjugated polymers enhances performance of photovoltaics by tuning ternary blend structures

Nano Energy (2017)

Yu‐Che Lin Hao‐Wen Cheng Yu‐Wei Su Bo-Hsien Lin Yi-Ju Lu

Side chain

Acceptor

Active layer

10.1016/j.nanoen.2017.11.016

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Citations (53)

Hexaaqua Metal Complexes for Low-Temperature Formation of Fully Metal Oxide Thin-Film Transistors

Chemistry of Materials (2015)

You Seung Rim Huajun Chen Tze‐Bin Song Sang‐Hoon Bae Yang Yang

We investigated aqueous metal complex-based oxide semiconductor films formed with various ligands, such as chloride, acetate, fluoride, and nitrate. Nitrate ligand-based indium(III) precursor was easily decomposed at low temperature due to the replacement of all nitrate ions with water during solvation to form the hexaaqua indium(III) cation ([In(H2O)6]3+). Hexaaqua indium(III) cation was a key complex to realize high-quality oxide films at low temperature. Additionally, Al2O3-based high-k dielectric was also employed by using a nitrate precursor, and the hexaaqua aluminum(III) cation ([Al(H2O)6]3+) was confirmed. This complex-based Al2O3 film showed high breakdown voltage and stable capacitance under high frequency operation compared to organic solvent-based Al2O3 films. We successfully demonstrated aqueous-based In2O3 TFTs with Al2O3 high-k gate dielectrics formed at 250 °C with a wide gate voltage operation and high saturation mobility and on/off ratio of 36.31 ± 2.29 cm2 V–1 s–1 and over 107, respectively.

10.1021/acs.chemmater.5b02505

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Citations (87)

Self‐Assembled Amphiphilic Monolayer for Efficient and Stable Wide‐Bandgap Perovskite Solar Cells

Advanced Energy Materials (2022)

Lu Liu Yang Yang Minyong Du Yuexian Cao Xiaodong Ren

Abstract The applications of wide‐bandgap (WBG) perovskite solar cells (PSCs) are limited by their subpar efficiency and stability due to their high density of defects, especially those at interfaces. Theoretical analyses suggest a monolayer of molecules, which is of minimum thickness and, hence, minimum resistance across the interface, possessing multifunctional groups and a permanent dipole, should effectively passivate the defects and minimize energy losses at interfaces. Herein, a self‐assembled monolayer (SAM) composed of amphiphilic molecules is designed and assembled as the interface layer to reduce the energy loss and enhance interface coupling between the perovskite and hole transport layer. It is found that the SAM also builds a back surface field through a p‐type doping effect, which promotes hole extraction and suppress the carrier recombination. Consequently, a remarkable power conversion efficiency (PCE) of 20.4% in parallel with a high open‐circuit voltage up to 1.25 V is attained. Additionally, an indoor PCE of 38.7% is realized. Both are among the best in their respective categories. Moreover, an all‐perovskite tandem solar cell is configured, presenting a decent PCE of 23.2%. This work emphasizes the significance of WBG PSCs for optoelectronic applications and indicates the eminent effects of SAMs for optimization of WBG PSCs.

Passivation

Tandem

10.1002/aenm.202202802

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Citations (55)

Enhanced Carrier Dynamics of CsPbBr₃ Nanocrystals Enabled by Short-Ligand Ethanedithiol for Efficient Photoelectrocatalytic Photoanodes

ACS Applied Materials & Interfaces (2023)

Wenxiao Gong Yang Yang Yulan Li Heng Guo Xiaobin Niu

Photoelectrochemical (PEC) water splitting is a potential solution for a low-carbon society and clean energy storage due to its ability to produce hydrogen and oxygen. However, the slow oxidation half-reaction of the process has limited its overall efficacy, necessitating the development of an efficient photoanode. Colloidal CsPbBr3 nanocrystals (NCs) have been identified as promising candidates due to their high light absorption and valence band position. However, the presence of the electrical insulator, long-chain oleate molecules, on the surface of the CsPbBr3 NCs has hindered efficient charge carrier separation and transport. To solve this problem, short-chain 1,2-ethanedithiol (EDT) ligands were used to replace the oleate ligands on the surface of the CsPbBr3 NCs through a solid-state ligand exchange method. This resulted in a reduction of the nanocrystal spacing and a cross-linking reaction, which improved the photogenerated carrier separation and transport while still passivating the dangling bonds on the CsPbBr3 NC surface. Ultimately, this led to a remarkable photocurrent density of 3.34 mA cm–2 (1.23 VRHE), which was 5.2 times higher than that of the pristine oleate-CsPbBr3 NC (0.64 mA cm–2)-based device. This work presents an efficient way of developing inorganic lead halide perovskite colloidal nanocrystal-based photoanodes through surface ligand engineering.

Photocurrent

Dangling bond

10.1021/acsami.3c07073

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Citations (1)