Article
Chemistry, Physical
Yannan Zhang, Zeke Liu, Wanli Ma
Summary: This perspective summarizes the important research progress in transport layer materials, structures, and interfacial passivation of PbS CQD solar cells. The development of new charge transport layers and interfacial passivation strategies has significantly improved the efficiency and stability of CQD solar cells. The remaining challenges and potential development directions for charge transport layers are also discussed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Maral Vafaie, James Z. Fan, Amin Morteza Najarian, Olivier Ouellette, Laxmi Kishore Sagar, Koen Bertens, Bin Sun, F. Pelayo Garcia de Arquer, Edward H. Sargent
Summary: Efficient ligand exchange route enables large-diameter CQDs to achieve high-efficiency passivation and charge transport, leading to CQD solids with external quantum efficiency greater than 80% at 1,550 nm. This technology has the potential to replace conventional III-V semiconductors and make significant advancements in the field of infrared photodetection.
Article
Nanoscience & Nanotechnology
Riya Dutta, Avradip Pradhan, Praloy Mondal, Saloni Kakkar, T. Phanindra Sai, Arindam Ghosh, Jaydeep Kumar Basu
Summary: Hybrid devices consisting of graphene or TMDs and semiconductor QDs have been widely studied for photodetector and photovoltaic applications, requiring high IQE and enhanced carrier diffusion length. Electrical measurements on such devices showed high IQE and significant enhancement of carrier diffusion length, which could be tuned by varying back gate voltage and controlling charge separation from the proximal QD layer. The obtained IQE values were remarkably high, and further improvement could be achieved by stacking multiple layers of QDs for potential applications in high-efficiency photodetectors and active photovoltaic materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jonghee Yang, Ashish Sharma, Jung Won Yoon, Watcharaphol Paritmongkol, Seungjin Lee, Hyungju Ahn, Wooseop Lee, Hochan Song, Woo Hyeon Jeong, Bo Ram Lee, Seo-Jin Ko, Mahshid Ahmadi, Edward H. H. Sargent, Hyosung Choi
Summary: Researchers have discovered that randomly-oriented, but closer-packed crystalline structures in bulk heterojunctions (BHJs) can significantly improve charge conduction and restrict diffusion-driven charge transfer process, allowing for ultrafast hole extraction from colloidal quantum dots (CQDs) to BHJs. This finding not only provides key principles to control the packing structures of organic hole transport layers (HTLs), but also opens up a new avenue to enhance optoelectronic performance.
ADVANCED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Lingju Meng, Xihua Wang
Summary: This article focuses on the research progress and applications of doping techniques for colloidal quantum dot materials, as well as innovative solutions to doping issues. By analyzing lead chalcogenide CQDs and perovskite CQDs, the different working scenarios of each doping technique are compared, and future perspectives are raised.
Article
Materials Science, Multidisciplinary
Junwoo Lee, Duck Hoon Lee, Younghoon Kim, Jin Young Park, Hyung Ryul You, Taiho Park, Minjun Kim, Jongmin Choi
Summary: A novel benzodifuran-based hole-transporting material (HTM) was synthesized, which exhibited improved optoelectrical properties, solubility, and thermal stability compared to a typical benzodithiophene-based HTM. The benzodifuran-based HTM showed enhanced performance in quantum dot solar cells, achieving higher open-circuit voltage and power conversion efficiency.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Review
Chemistry, Physical
Yang Liu, Guozheng Shi, Zeke Liu, Wanli Ma
Summary: Lead chalcogenide colloidal quantum dots are promising for low-cost, large-area, and flexible solar cells. The development of CQD inks has improved device performance and simplified fabrication processes, showing potential for commercialization in solar module production.
NANOSCALE HORIZONS
(2021)
Article
Nanoscience & Nanotechnology
Jonghee Yang, Minseon Kim, Seungjin Lee, Jung Won Yoon, Sanchari Shome, Koen Bertens, Hochan Song, Seul Gi Lim, Jae Taek Oh, Sung Yong Bae, Bo Ram Lee, Whikun Yi, Edward H. Sargent, Hyosung Choi
Summary: The development of a hybrid solvent system enables the fabrication of stable CQD inks for producing homogeneous, large-area CQD films. CQDPVs fabricated with this ink exhibit improved charge transport properties and higher energy conversion efficiency compared to conventional inks.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Adrien Khalili, Claire Abadie, Tung Huu Dang, Audrey Chu, Eva Izquierdo, Corentin Dabard, Charlie Greboval, Mariarosa Cavallo, Huichen Zhang, Stefano Pierini, Yoann Prado, Xiang Zhen Xu, Sandrine Ithurria, Gregory Vincent, Christophe Coinon, Ludovic Desplanque, Emmanuel Lhuillier
Summary: This study proposes a method to broaden the spectral range of InGaAs by using HgTe nanocrystals and alleviating lattice matching constraints in short wave infrared sensing. A diode structure is designed, where a p-type HgTe NC array and n-type InGaAs wires are used to extract minority carriers. This work opens up new possibilities for infrared detection using epitaxially grown and colloidally grown semiconductors.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jianfu Han, Kai Huang, Xuanguang Su, Xiaofei Xiao, Xuemin Gong, Haibin Wang, Juexian Cao
Summary: PbS colloidal quantum dots (CQDs) usually suffer from low carrier mobility due to surface ligand isolation and defects. By combining PbS CQD photodiode with a carbon nanotube (CNT) film field-effect transistor (FET), a transistorized NIR photodetector with high performance and ultrahigh external quantum efficiency (EQE) is achieved.
Review
Chemistry, Multidisciplinary
Mohamad Insan Nugraha, Indriyati Indriyati, Indah Primadona, Murali Gedda, Gerald Ensang Timuda, Ferry Iskandar, Thomas D. Anthopoulos
Summary: This article reviews recent progress in the use of semiconducting colloidal quantum dots (CQDs) in emerging thin-film thermoelectrics. It outlines the fundamental concepts of thermoelectricity in nanostructured materials, provides an overview of popular synthetic methods for producing CQDs, and discusses their application in thin-film thermoelectric generators (TEGs). The current challenges and future perspectives for enhancing the performance of CQD-based thermoelectric materials are also discussed.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Mohamad Insan Nugraha, Indriyati Indriyati, Indah Primadona, Murali Gedda, Gerald Ensang Timuda, Ferry Iskandar, Thomas D. D. Anthopoulos
Summary: Semiconducting colloidal quantum dots (CQDs) are a promising class of thermoelectric materials for future applications. They offer solution processability and scalable manufacturing potential. With their unique low dimensionality, CQDs can be utilized to tune the Seebeck coefficient and thermal conductivity independently, making them suitable for use in thin-film thermoelectric generators (TEGs) operating near room temperature.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ge Mu, Tianyu Rao, Shuo Zhang, Chong Wen, Menglu Chen, Qun Hao, Xin Tang
Summary: This study reports colloidal quantum-dot upconverters with unprecedented performance, achieving a wider range of operation spectral and higher efficiency through optimization of device structure.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Xingyu Shen, John C. Peterson, Philippe Guyot-Sionnest
Summary: Mid-infrared HgTe colloidal quantum dot electroluminescent devices with high external quantum efficiency and power conversion efficiency were demonstrated. The power conversion efficiency was improved by reducing the resistance of the transparent electrode through the incorporation of a metal conductive grid.
Article
Chemistry, Multidisciplinary
Changjo Kim, Irem Kozakci, Sang Yeon Lee, Byeongsu Kim, Junho Kim, Jihyung Lee, Boo Soo Ma, Eun Sung Oh, Taek-Soo Kim, Jung-Yong Lee
Summary: This study proposes a facile approach to improve the mechanical stability of CQD solar cells without compromising the high power conversion efficiency. By introducing (3-aminopropyl)triethoxysilane (APTS) on CQD films, the dot-to-dot bonding is strengthened, making the treated devices robust to mechanical stress. The device maintains 88% of the initial PCE under 12,000 cycles at a bending radius of 8.3 mm and achieves a PCE of 11.04%, one of the highest PCEs in flexible PbS CQD solar cells.
Article
Chemistry, Multidisciplinary
Mingchuan Luo, Adnan Ozden, Ziyun Wang, Fengwang Li, Jianan Erick Huang, Sung-Fu Hung, Yuhang Wang, Jun Li, Dae-Hyun Nam, Yuguang C. Li, Yi Xu, Ruihu Lu, Shuzhen Zhang, Yanwei Lum, Yang Ren, Longlong Fan, Fei Wang, Hui-hui Li, Dominique Appadoo, Cao-Thang Dinh, Yuan Liu, Bin Chen, Joshua Wicks, Haijie Chen, David Sinton, Edward H. Sargent
Summary: Upgrading carbon dioxide/monoxide to multi-carbon C2+ products using renewable electricity offers a sustainable approach to fuel and chemical production. A new coordination polymer catalyst consisting of Cu(I) and benzimidazole units linked via Cu(I)-imidazole coordination bonds enables selective reduction of CO to acetate with a 61% Faradaic efficiency. The catalyst integrated in a cation exchange membrane-based membrane electrode assembly allows stable acetate electrosynthesis and achieves concentrated acetate collection, high CO-to-acetate conversion efficiency, and good acetate full-cell energy efficiency.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Hao Chen, Aidan Maxwell, Chongwen Li, Sam Teale, Bin Chen, Tong Zhu, Esma Ugur, George Harrison, Luke Grater, Junke Wang, Zaiwei Wang, Lewei Zeng, So Min Park, Lei Chen, Peter Serles, Rasha Abbas Awni, Biwas Subedi, Xiaopeng Zheng, Chuanxiao Xiao, Nikolas J. Podraza, Tobin Filleter, Cheng Liu, Yi Yang, Joseph M. Luther, Stefaan De Wolf, Mercouri G. Kanatzidis, Yanfa Yan, Edward H. Sargent
Summary: The open-circuit voltage deficit in wide-bandgap perovskite solar cells is larger than in perovskites with a bandgap of approximately 1.5 eV. The limiting factor for the open-circuit voltage is found to be recombination at the electron-transport-layer contact, resulting from inhomogeneous surface potential and poor energetic alignment. To address this issue, a new surface treatment using diammonium molecules is introduced to achieve a more uniform distribution of surface potential.
Article
Chemistry, Multidisciplinary
Ning Wang, Pengfei Ou, Rui Kai Miao, Yuxin Chang, Ziyun Wang, Sung-Fu Hung, Jehad Abed, Adnan Ozden, Hsuan-Yu Chen, Heng-Liang Wu, Jianan Erick Huang, Daojin Zhou, Weiyan Ni, Lizhou Fan, Yu Yan, Tao Peng, David Sinton, Yongchang Liu, Hongyan Liang, Edward H. Sargent
Summary: Acidic water electrolysis is used to produce hydrogen for chemical and fuel applications. Doping Ba cations into a Co3O4 framework promotes the oxide path mechanism and improves activity in acidic electrolytes, leading to more efficient water oxidation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Pawan Kumar, Karthick Kannimuthu, Ali Shayesteh Zeraati, Soumyabrata Roy, Xiao Wang, Xiyang Wang, Subhajyoti Samanta, Kristen A. Miller, Maria Molina, Dhwanil Trivedi, Jehad Abed, Astrid Campos Mata, Hasan Al-Mahayni, Jonas Baltrusaitis, George Shimizu, Yimin A. Wu, Ali Seifitokaldani, Edward H. Sargent, Pulickel M. Ajayan, Jinguang Hu, Md Golam Kibria
Summary: This study presents a macromolecule-assisted synthesis approach for single atom catalysts (SACs) that allows for the production of high-density cobalt single atoms with exceptional catalytic properties. The resulting SACs, embedded within a highly porous carbon network, exhibited significantly enhanced electrocatalytic activity for the oxygen evolution reaction (OER), with long-term stability. Experimental and theoretical results provide valuable insights into the mechanisms underlying the improved catalytic performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ya-Kun Wang, Haoyue Wan, Jian Xu, Yun Zhong, Eui Dae Jung, So Min Park, Sam Teale, Muhammad Imran, You-Jun Yu, Pan Xia, Yu-Ho Won, Kwang-Hee Kim, Zheng-Hong Lu, Liang-Sheng Liao, Sjoerd Hoogland, Edward H. Sargent
Summary: Researchers have developed a bifunctional ETL (CNT2T) to address the issues caused by the electron-transporting layer (ETL) in red InP LEDs, resulting in significantly improved efficiency and brightness of the devices.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Amanda F. Baxter, Jehad Abed, Daniela V. Fraga V. Alvarez, Daojin Zhou, Dhruti Kuvar, Edward H. Sargent, Daniel V. Esposito
Summary: In this study, RuO2 nanoparticles were encapsulated with semipermeable, nanoscopic SiOx overlayers to improve their stability. The best-performing SiOx|RuO2 electrodes consisted of 2-3 nm thick SiOx overlayers on top of RuO2 particles. These electrodes exhibited lower overpotentials and demonstrated an ability to retain OER activity over time.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Zongjie Wang, Hansen Wang, Sichun Lin, Mahmoud Labib, Sharif Ahmed, Jagotamoy Das, Stephane Angers, Edward H. Sargent, Shana O. Kelley
Summary: Nanoneedles are effective in delivering biomolecules to cells, but the mechanisms underlying cell-nanoneedle interactions are not well understood. In this study, we developed a new method to generate nanoneedles, confirmed their cargo delivery capability, and investigated the genetic factors involved in the process. Our results showed that the nanoneedles disrupted cell membranes, increased the expression of cell-cell junction proteins, and downregulated transcriptional factors of the NF kappa B pathway. This disturbance caused most cells to be trapped in the G2 phase, where endocytosis activities are highest. This system provides a new model for studying cell interactions with high-aspect-ratio materials.
Article
Chemistry, Multidisciplinary
Ozan Atan, Joao M. Pina, Darshan H. Parmar, Pan Xia, Yangning Zhang, Ahmet Gulsaran, Eui Dae Jung, Dongsun Choi, Muhammad Imran, Mustafa Yavuz, Sjoerd Hoogland, Edward H. Sargent
Summary: Solution-processed colloidal quantum dots (CQDs) are promising materials for short-wavelength infrared (SWIR) photodetectors. However, the low carrier mobility of CQD-based hole transport layers (HTL) limits the photodiode response speed. By employing NiOx as the HTL in inverted SWIR photodetectors, we achieve 4x shorter fall times compared to CQDs treated with 1,2-ethanedithiol (EDT). Optoelectronic simulations show that the high carrier mobility of NiOx enhances the electric field in the active layer, reducing transport time and increasing photodetector response time.
Article
Chemistry, Physical
Richard Tran, Janice Lan, Muhammed Shuaibi, Brandon M. Wood, Siddharth Goyal, Abhishek Das, Javier Heras-Domingo, Adeesh Kolluru, Ammar Rizvi, Nima Shoghi, Anuroop Sriram, Felix Therrien, Jehad Abed, Oleksandr Voznyy, Edward H. Sargent, Zachary Ulissi, C. . Lawrence Zitnick
Summary: To address the lack of training data for oxide materials, researchers developed the OC22 dataset consisting of 62,331 DFT relaxations across various oxide materials. By combining the OC22 dataset with the OC20 dataset, significant improvements were achieved in energy predictions for oxide surfaces. This study provides an important benchmark for models aiming to incorporate complex electrostatic and magnetic interactions in oxide surfaces.
Article
Materials Science, Multidisciplinary
Ilgeum Lee, Omar Allam, Jiweon Kim, Yixuan Dou, Hyungju Ahn, Andrew Proppe, Yitong Dong, Dongxin Ma, Li Na Quan, Edward H. Sargent, Seung Soon Jang, Dong Ha Kim
Summary: Efficient blue-emitting materials with single-halide RPPs using organic spacer engineering are reported in this study. The (110)-oriented thin films exhibit larger bandgap and enhanced stability, regardless of the choice of spacers, compared to other structures. This new class of RPPs exhibits sky-blue emission at 483 nm with a quantum efficiency of approximately 62%. The established protocol and strategy can be utilized to develop blue perovskite LEDs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Jonathan P. Edwards, Theïo Alerte, Colin P. O'Brien, Christine M. Gabardo, Shijie Liu, Joshua Wicks, Adriana Gaona, Jehad Abed, Yurou Celine Xiao, Daniel Young, Armin Sedighian Rasouli, Amitava Sarkar, Shaffiq A. Jaffer, Heather L. MacLean, Edward H. Sargent, David Sinton
Summary: Carbon dioxide electrolysispowered with renewable electricity is a promising method for converting emissions into valuable chemicals and fuels. However, there are technological gaps that need to be addressed before industrial implementation, including pilot plant demonstrations and the development of accurate process models. In this study, a semi-empirical electrolyzer model was developed and validated using lab- and pilot-scale data. The results showed that the model can accurately predict the performance metrics of the electrolyzer, providing a foundation for further scaling of CO2 electrolysis.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Yujin Jung, Hyeyoung Shin, Se-Woong Baek, Truong Ba Tai, Benjamin Scheffel, Olivier Ouellette, Margherita Biondi, Sjoerd Hoogland, F. Pelayo Garcia de Arquer, Edward H. Sargent
Summary: Solution-processed semiconducting materials have potential for high-performance, low-cost, and flexible energy conversion devices. By using a library of surface ligands with different functions, the photophysical mismatch at the colloidal quantum dot (CQD)/organic interface was addressed, resulting in improved charge transfer efficiency. Hybrid CQD/organic heterojunction solar cells showed record photocurrent density and near-unity broadband quantum efficiency.
ACS ENERGY LETTERS
(2023)
Article
Energy & Fuels
Tiantian Li, Jian Xu, Renxing Lin, Sam Teale, Hongjiang Li, Zhou Liu, Chenyang Duan, Qian Zhao, Ke Xiao, Pu Wu, Bin Chen, Sheng Jiang, Shaobing Xiong, Haowen Luo, Sushu Wan, Ludong Li, Qinye Bao, Yuxi Tian, Xueping Gao, Jin Xie, Edward H. Sargent, Hairen Tan
Summary: Operating stability is a priority issue for all-perovskite tandem solar cells. Inorganic CsPbI3-xBrx perovskites show promise as alternatives due to their good photostability. By inserting a passivating dipole layer at the interface between organic transport layers and inorganic perovskite, the energetic mismatch is reduced and charge extraction is accelerated, resulting in improved efficiency.
Article
Materials Science, Multidisciplinary
Hitarth Choubisa, Jehad Abed, Douglas Mendoza, Hidetoshi Matsumura, Masahiko Sugimura, Zhenpeng Yao, Ziyun Wang, Brandon R. Sutherland, Alan Aspuru-Guzik, Edward H. Sargent
Summary: Accurate and efficient search algorithms are critical for accelerating the discovery of materials with desirable properties. By combining cluster expansion with a quantum-inspired superposition technique, we leverage quantum annealers in chemical space exploration for the first time, speeding up the search for materials by 10-50 times compared to genetic algorithms and Bayesian optimizations, with improved ground state prediction accuracy. We apply this to the discovery of acidic oxygen evolution reaction catalysts and identify a promising previously unexplored chemical family of Ru-Cr-Mn-Sb-O2, with a catalyst that exhibits a mass activity eight times higher than state-of-the-art RuO2 and maintains performance for 180 hours.
Article
Chemistry, Multidisciplinary
Ya-Kun Wang, Haoyue Wan, Jian Xu, Yun Zhong, Eui Dae Jung, So Min Park, Sam Teale, Muhammad Imran, You-Jun Yu, Pan Xia, Yu-Ho Won, Kwang-Hee Kim, Zheng-Hong Lu, Liang-Sheng Liao, Sjoerd Hoogland, Edward H. Sargent
Summary: Researchers synthesized a bifunctional electron-transporting layer to solve the issues caused by ZnO/ZnMgO in high-performance red InP/ZnSe/ZnS LEDs. They achieved red InP LEDs with an EQE of 15% and a luminance of over 12,000 cd m-2, setting a record among organic-ETL-based red InP LEDs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
