Optimal thickness of a PCBM layer and insertion the LiF interlayer on well-controlled flat surface perovskite film are essential for fabricating planar perovskite–PCBM solar cells.

Highly transparent and nanostructured nickel oxide (NiO) films through pulsed laser deposition are introduced for efficient CH3 NH3 PbI3 perovskite solar cells. The (111)-oriented NiO film plays a key role in extracting holes preventing electron leakage as hole transporting material. champion device exhibits power conversion efficiency of 17.3% with very high fill factor 0.813.

With the emergence of human interface technology, development new applications based on stretchable electronics such as conformal biosensors and rollable displays are required. However, difficulty in developing semiconducting materials with high stretchability required for has restricted range electronics. Here, we present stretchable, printable, transparent transistors composed monolithically patterned graphene films. This material offers excellent mechanical, electrical, optical...

Abstract Herein, this study reports high‐efficiency, low‐temperature ZnO based planar perovskite solar cells (PSCs) with state‐of‐the‐art performance. They are achieved via a strategy that combines dual‐functional self‐assembled monolayer (SAM) modification of electron accepting layers (EALs) sequential deposition active layers. The SAMs, constructed from newly synthesized molecules high dipole moments, act both as excellent surface wetting control and electric for ZnO‐EALs. insertion SAMs...

Structural control of solubilizing side groups in fullerene-based electron acceptors is critically important to optimize their performance bulk heterojunction (BHJ)-type polymer solar cell (PSC) devices. The structural changes fullerene derivatives affect not only optical and electrochemical properties but also solubility miscibility with donor polymers. Herein, we synthesized a series o-xylenyl C60 bis-adduct (OXCBA) different systematically investigate the effects derivative structures on...

Abstract A new type of nonvolatile ferroelectric poly(vinylidene fluoride‐ co ‐trifluoroethylene) (P(VDF‐TrFE)) memory based on an organic thin‐film transistor (OTFT) with a single crystal tri‐isopropylsilylethynyl pentacene (TIPS‐PEN) as the active layer is developed. bottom‐gate OTFT fabricated thin P(VDF‐TrFE) film gate insulator which one‐dimensional ribbon‐type TIPS‐PEN crystal, grown via solvent‐exchange method, positioned between Au source and drain electrodes. Post‐thermal treatment...

A series of conjugated copolymers based on a TPD moiety was synthesized as donor materials for OPVs.

Abstract Dark current density ( J dark ) is the most important factors determining signal‐to‐noise ratio, linear dynamic range and detectivity D * of organic photodetectors (OPDs). However, solution‐processed OPDs generally suffer from high under bias because origin still remains unclear related to complicate factors. In this work, effect fluorinated alkyl side chain (FAC) conjugated polymers (CPs) on OPD performance systematically investigated according number fluorine atom. The OPDs,...

Numerous conjugated polymer-based electrochromic devices (ECDs) have been developed, but the correlation between electronic properties of polymers (ECPs) and their EC performance, especially response speeds, has rarely explored. In this work, we propose two new dithienopyran-based ECPs containing different heteroatoms with distinct characteristics to elucidate effect structure on performance. When electron-donating alkoxy groups are fused into (P(DT-P)), highest occupied molecular orbital...

Abstract Narrow bandgap non‐fullerene acceptors (NBG NFAs) are crucial in advancing near‐infrared organic photodetectors (NIR OPDs). However, the polymorphous behavior of NFAs introduces energetic disorder and charge‐trapping sites bulk heterojunction (BHJ) active layers, thereby hindering NIR performance OPDs. This study demonstrates design optimization molecular structures alkyl side chains to morphologically address these electrical limitations shed light on how affect...

The power-conversion efficiency of an organic photovoltaic cell composed poly(3-hexylthiophene) and (6,6)-phenyl-C61-butyric acid methyl ester is enhanced significantly by controlling the surface morphology photoactive layer. hierarchical micro-/nanostructures active-layer are fabricated nanoimprinting active layer with a commercially available, anodic aluminum oxide (AAO) membrane filter (see image).

The ability to control the lowest unoccupied molecular orbital (LUMO) level of an electron-accepting material is a critical parameter for producing highly efficient polymer solar cells (PSCs). Soluble bis-adducts C60 have great potential improving VOC in PSCs because their high LUMO level. In this work, we developed novel o-xylenyl bis-adduct (OXCBA) via [4 + 2] cycloaddition between and irreversible diene intermediate from α,α′-dibromo-o-xylene. OXCBA was successfully applied as electron...

The ability to tune the lowest unoccupied molecular orbital (LUMO)/highest occupied (HOMO) levels of fullerene derivatives used as electron acceptors is crucial in controlling optical/electrochemical properties these materials and open circuit voltage (V(oc)) solar cells. Here, we report a series indene multiadducts (ICMA, ICBA, ICTA) which different numbers solubilizing groups are attached molecule. addition units raised its LUMO HOMO levels, resulting higher V(oc) values photovoltaic...

Optimization and analysis of conjugated polymer side chains for high‐performance organic photovoltaic cells (OPVs) reveal a critical relationship between the chemical structure properties polymer‐based bulk heterojunction OPVs. In particular, impact alkyl chain length on π‐bridging (thienothiophene, TT) unit is considered by designing synthesizing series benzodithiophene derivatives (BDT(T)) thieno[3,2‐b]thiophene‐π‐bridged thieno[3,4‐c]pyrrole‐4,6(5H)‐dione (ttTPD) alternating copolymers,...

Incorporation of a 2,5-difluorobenzene (F2B) moiety provides unique structure with improved molecular ordering and blend morphology, giving PCE reaching 5% using an F2B-containing acceptor (F2B-T2PDI) whereas counterpart gave only 3.63%.

Abstract Near‐infrared organic photodetectors (NIR OPDs) comprising ultra‐narrow bandgap non‐fullerene acceptors (NFA, over 1000 nm) typically exhibit high dark current density under applied reverse bias. Therefore, suppression of is crucial to achieve high‐performance such NIR OPDs. Herein, cyano (CN) with a strong electron‐withdrawing property introduced into alkoxy thiophene as π‐bridge adjust its optoelectronic characteristics, and the correlation between charge injection barrier...

Abstract Ultra-flexible organic photovoltaics (OPVs) are promising candidates for next-generation power sources owing to their low weight, transparency, and flexibility. However, obtaining ultra-flexibility under extreme repetitive mechanical stress while maintaining optical transparency remains challenging because of the intrinsic brittleness transparent electrodes. Here, we introduce strain-durable ultra-flexible semitransparent OPVs with a thickness below 2 μm. The conformal surface...

Recently, the development of non-fullerene acceptors (NFAs) for near-infrared (NIR) organic photodetectors (OPDs) has attracted great interest due to their excellent NIR light absorption properties. Herein, we developed NFAs by substituting an electron-donating moiety (branched alkoxy thiophene (BAT)) asymmetrically (YOR1) and symmetrically (YOR2) Y6 framework. YOR1 exhibited nanoscale phase separation in a film blended with PTB7-Th. Moreover, BAT unit effectively extended wavelengths over...

Fullerene tris-adducts have the potential of achieving high open-circuit voltages (VOC) in bulk heterojunction (BHJ) polymer solar cells (PSCs), because their lowest unoccupied molecular orbital (LUMO) level is higher than those fullerene mono- and bis-adducts. However, no successful examples use as electron acceptors been reported. Herein, we developed a ternary-blend approach for to fully exploit merit LUMO level. The compound o-xylenyl C60 tris-adduct (OXCTA) was used ternary acceptor...

We have found that 9,9′BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4′BP do not show any photovoltaic effect. This related to the respective aromaticity and antiaromaticity of reduced forms or 4,4′BP. The OPV device fabricated P3HT exhibited a PCE 2.28% with Voc 1.07 V, Jsc 5.04 mA cm−2, FF 0.42.

Solution-processable hole-transporting layers (HTLs) capable of cross-linking are especially important in solution-processed organic light-emitting diodes (OLEDs) to achieve multilayer structures with separated charge-transporting and emitting layers. In this work, we report the first example photo cross-linked HTL adopting "thiol–ene" reaction. A new allyl-containing polymer, Allyl-TFB, has been synthesized characterized by NMR, TGA, DSC, UV-vis spectroscopy, cyclic voltammetry, etc. The...