With the power conversion efficiency of polymer solar cells (PSCs) approaching milestone value 10%, their instability associated with a low work function metal cathode, particularly in presence oxygen and moisture, becomes critical issue for real applications. To alleviate air-sensitive problem, two easy-accessible solution-processed, environmentally friendly organic small-molecule cathode interlayers, perylene diimides (PDI) as core amino (PDIN) or N-oxide (PDINO) terminal substituent, are...

The fill factor (FF) is an important parameter that determines the power conversion efficiency of organic solar cell. There are several factors can significantly influence FF, and these interact with each other very intricately. Due to this reason, a deep understanding FF quite difficult. Based on three fundamental elements in cell equivalent circuit, namely series resistance, shunt resistance diode, we reviews research progress cells. Physics lying behind often-observed undesirable S-shaped...

With the rapid evolution of photovoltaic polymer materials, power conversion efficiency solar cells has been markedly improved in recent years, and is now approaching a landmark value 10 %. This review focuses on Donor–Acceptor (D–A) copolymers. Starting from briefly introducing D–A concept, fundamental donor acceptor units for constructing materials are introduced classified. By summarizing structure–property relationships typical copolymers, important design rules such highlighted. Several...

Open-circuit voltage (VOC) is the maximum a solar cell can provide to an external circuit, which derived from splitting of hole and electron quasi-Fermi levels. In crystalline Si cells, effective density states at bottom (top) conduction (valence) band constant, level be directly calculated via Fermi–Dirac distribution. However, in organic materials, similar amorphous Si, disorder induces gap tail states. Relaxation carriers into these brings down up, hence reduces VOC. Furthermore, carrier...

Graphdiyne (GD), a novel carbon allotrope with 2D structure comprising benzene rings and carbon–carbon triple bonds, is successfully integrated ZnO nanoparticles by wet chemistry method. An ultraviolet photodetector based on these graphdiyne:ZnO nanocomposites exhibits significantly enhanced performance in comparison conventional device. GD may have diverse applications future optoelectronics. As service to our authors readers, this journal provides supporting information supplied the...

Graphdiyne (GDY) is an ordered two-dimensional (2D) carbon allotrope comprising sp- and sp2-hybridized atoms with high degrees of π-conjugation, which features a natural band gap superior electric properties. However, the synthesis one- or few-layer GDY remains challenging because free rotation around alkyne-aryl single bonds lack thickness control. We report facile ultrathin single-crystalline film on graphene through solution-phase van der Waals epitaxial strategy. The weak...

Abstract Regulating the electron transport layer (ETL) has been an effective way to promote power conversion efficiency (PCE) of perovskite solar cells (PSCs) as well suppress their hysteresis. Herein, SnO 2 ETL using a cost‐effective modification material rubidium fluoride (RbF) is modified in two methods: 1) adding RbF into colloidal dispersion, F and Sn have strong interaction, confirmed via X‐ray photoelectron spectra density functional theory results, contributing improved mobility ; 2)...

Due to their wide tunable bandgaps, high absorption coefficients, easy solution processabilities, and stabilities in air, lead sulfide (PbS) quantum dots (QDs) are increasingly regarded as promising material candidates for next-generation light, low-cost, flexible photodetectors. Current single-layer PbS-QD photodetectors suffer from shortcomings of large dark currents, low on-off ratios, slow light responses. Integration with metal nanoparticles, organics, high-conducting graphene/nanotube...

Defect passivation is an effective method to improve the performance of perovskite solar cells. In this study, four phenethylammonium iodides featuring different functional groups directly linking benzene ring are introduced on surface films ((FAPbI3)1–x(MAPbBr3–yCly)x) investigate their effects. It found that electron density has significant influence interfacial passivation: iodide with electron-donating (methoxyl and methyl) present favorable effects, while salt electron-withdrawing group...

Graphdiyne, a novel large π‐conjugated carbon hole transporting material, is employed as anode buffer layer in colloidal quantum dots solar cells. Power conversion efficiency notably enhanced to 10.64% from 9.49% compared relevant reference devices. Hole transfer the dot solid active can be appreciably only by using graphdiyne lower work function of solid. It found that all‐carbon prolongs carrier lifetime, reducing surface recombination on previously neglected back side photovoltaic device....

Abstract Owing to their ease of fabrication, low cost, and high flexibility, organic materials have attracted great interests in photodetector (PD) applications. However, suffering from large dark current, small photocurrent, on–off ratio, sensitivity, performances bare organic‐based PDs are not satisfactory. Integrating with other novel semiconductor offers an opportunity overcome these drawbacks. Here, a lateral hybrid organic/lead sulfide (PbS) quantum dot bilayer PD is designed...

Exploration of high-performance solution-processed n-channel organic transistors with excellent stability is a critical issue for the development powerful printed circuits. Solution-processed, bottom-gate exhibiting record electron mobility up to 1.2 cm2 V−1 s−1 are reported. The devices show stability, which enables construction all-solution-processed flexible circuits all fabrication procedures performed in air. Detailed facts importance specialist readers published as "Supporting...

Transparent ultraviolet (UV) ZnO thin film photoconductors are expected to have great applications in environmental monitoring, large-area displays and optical communications they drawn enormous interests recent years. However, at present their performances not satisfactory: the responsivity R (a parameter characterizing sensitivity of device light) is high (<1.0 × 103 AW−1) transparency T either (<80%). Realizing remains a big challenge today. In this paper, by employing solution-processed...

The graphdiyne (GD), a carbon allotrope with 2D structure comprising benzene rings and carbon–carbon triple bonds, can be synthesized through cross-coupling on the surface of copper foil. key problem is in understanding dependence layers number properties, however, controlled growth numbers GD film have not been demonstrated, its into large-area high ordered films different still an important challenge. Here, we show that new strategy for synthesizing nanostructures ZnO nanorod arrays...

By inserting a PCBM (phenyl-C61-butyric acid methyl ester) layer between P3HT (poly(3-hexylthiophene)):PCBM blend and Ca/Al cathode, the performance of P3HT:PCBM bulk-heterojunction polymer solar cells is greatly improved. The maximum power conversion efficiency reached 4.24%, which much higher than that traditional standard based device (3.57%). exploring various experimental techniques including absorption spectroscopy, X-ray photoelectron spectroscopy impedance we have found enhancement...

Abstract Comparing to other carbon materials, the general graphyne structure is much superior in terms of adaptable bandgap, uniformly distributed pores, more design flexibility, easier for chemical synthesis, pliable electronic properties, and smaller atomic density. Herein, novel γ‐graphdiyne quantum dots (GD QDs) are used perovskite solar cells as a surface modifier or dopant TiO 2 , CH 3 NH PbI Spiro‐OMeTAD realize multiple advantageous effects, hoping that it would form effective...

ADVERTISEMENT RETURN TO ARTICLES ASAPViewpointNEXTRecent Progress in Regulating Surface Potential for High-Efficiency Perovskite Solar CellsJiaheng NieJiaheng NieSchool of Cybersecurity (Xin Gu Industrial College), Chengdu University Information Technology, 610225, ChinaMore by Jiaheng Nie, Yaming ZhangYaming ZhangSchool Physics, Electronic Science and Technology China, 610054, Zhang, Jizheng WangJizheng WangBeijing National Laboratory Molecular Sciences, CAS Key Organic Solids, Institute...

Abstract In perovskite solar cells (PSCs), the inherent defects of film and random distribution excess lead iodide (PbI 2 ) prevent improvement efficiency stability. Herein, natural cellulose is used as raw material to design a series derivatives for crystallization engineering. The cationic derivative C-Im-CN with cyano-imidazolium (Im-CN) cation chloride anion prominently promotes process, grain growth, directional orientation perovskite. Meanwhile, PbI transferred surface grains or formed...

Abstract Thermally induced tensile strain that remains in perovskite films after annealing is one of the key reasons for diminishing performance and operational stability solar cells (PSCs). Herein, a glass transition temperature ( T g ) regulation (TR) strategy developed by introducing two polymerizable monomers, 2‐(N‐3‐Sulfopropyl‐N, N ‐dimethyl ammonium)ethyl methacrylate (SBMA) 2‐Hydroxyethyl acrylate (HEA), into layer. SBMA HEA undergo situ polymerization, which regulates nucleation...

Abstract The recently developed planar architecture (ITO/ZnO/PbS-TBAI/PbS-EDT/Au) has greatly improved the power conversion efficiency of colloidal quantum dot photovoltaics (QDPVs). However, performance is still far below theoretical expectations and trap states in PbS-TBAI film are believed to be major origin, characterization understanding traps highly demanded develop strategies for continued improvement. Here employing impedance spectroscopy we detect PbS QDPVs. We determined a state...