Herein, we describe the synthesis of fluorinated polythienothiophene-co-benzodithiophenes (PTBFs) and characterization their physical properties, especially performance in solar cells. Fluorination polymer backbone lowered both HOMO LUMO energy levels simultaneously widened bandgap (0.1−0.2 eV). Incorporation fluorine into various positions significantly affected cells' power conversion efficiency from 2.3% to 7.2%. Detailed studies revealed that containing mono-fluorinated thienothiophene...

A new low band gap copolymer PBB3 containing [6,6']bi[thieno[3,4-b]thiophenyl]-2,2'-dicarboxylic acid bis-(2-butyloctyl) ester (BTT) and 4,8-bis(2-butyloctyl)benzo[1,2-b:4,5-b']dithiophene (BDT) units was synthesized tested for solar cell efficiency. showed a broad absorbance in the near-IR region with substantially red-shifted (by more than 100 nm) λ(max) at 790 nm as compared to PTB series of polymers, which have been previously reported. The polymer also both favorable energy level match...

High-performance inverted solar cells using various low-bandgap polymers are achieved by excellent metal oxide nanoparticles including ZnO and TiO2:Cs as an electron-transport layer (ETL). Power conversion efficiencies (PCE) high 7.3% with single based on PTB7:PC71BM. The results give a guideline for high-efficiency stable single-junction tandem polymer cells.

Perovskite solar cells (PSCs) based on organic monovalent cation (methylammonium or formamidinium) have shown excellent optoelectronic properties with high efficiencies above 22%, threatening the status of silicon cells. However, critical issues long‐term stability to be solved for commercialization. The severe weakness state‐of‐the‐art PSCs against moisture originates mainly from hygroscopic cations. Here, rubidium (Rb) is suggested as a promising candidate an inorganic–organic mixed system...

Copper-indium-selenide (CISe) quantum dots (QDs) are a promising alternative to the toxic cadmium- and lead-chalcogenide QDs generally used in photovoltaics due their low toxicity, narrow band gap, high absorption coefficient. Here, we demonstrate that photovoltaic performance of CISe QD-sensitized solar cells (QDSCs) can be greatly enhanced simply by optimizing thickness ZnS overlayers on TiO2 electrodes. By roughly doubling compared conventional one, conversion efficiency is about 40%....

In this perspective article, we discuss the development of organic photovoltaic (OPVs) solar cells. Our focus will be on discussing new donor polymers and device technologies, which resulted in enormous progress OPV performances with power conversion efficiencies (PCEs) 8–9%. However, for wide spread usage OPVs, high module (>10%) lifetimes suitable commercial applications are required. To achieve such goals, interdisciplinary advances light-harvesting materials, improvement structures, cost...

Conjugated polymers based on a heteroacene, 3,7-dialkyl-dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene (DBD), are synthesized. These show broad UV–vis absorption with energy bandgaps below 1.7 eV. PTDBD2, showing good miscibility in polymer/phenyl-C71-butyric acid methyl ester (PC71BM) blend film, achieves power conversion efficiency (PCE) of 7.6%. The results indicate that copolymers containing DBD promising candidates for high-performance organic solar cells.

Record-setting organic photovoltaic cells with PTB polymers have recently achieved ~8% power conversion efficiencies (PCE). A subset of these polymers, the PTBF series, has a common conjugated backbone alternating thieno[3,4-b]thiophene and benzodithiophene moieties but differs by number position pendant fluorine atoms attached to backbone. These electron-withdrawing fine tune energetics result in device PCE variations 2-8%. Using near-IR, ultrafast optical transient absorption (TA)...

High-mobility and low-voltage-operated organic field-effect transistors (OFETs) are demonstrated by the design of a new fluorinated benzothiadiazole-based conjugated polymer with high-k dielectrics. A record-breaking high hole mobility 9.0 cm2 V−1 s−1 for semiconducting polymers is achieved excellent planarity polymer. As service to our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized online delivery, but not...

Over the last ten years, polymer solar cells have been developed as an attractive alternative to traditional silicon photovoltaic devices. Remarkable progress has made in polymer-fullerene and several polymers shown power conversion efficiencies (PCEs) greater than 7%. The most important recent development synthesis of new low bandgap with optimal properties for cells. Herein we provide overview key strategies optimization highest occupied molecular orbital (HOMO) lowest unoccupied (LUMO)...

For realizing flexible perovskite solar cells (PSCs), it is important to develop low‐temperature processable interlayer materials with excellent charge transporting properties. Herein, a novel polymeric hole‐transport material based on 1,4‐bis(4‐sulfonatobutoxy)benzene and thiophene moieties (PhNa‐1T) its application as layer (HTL) of high‐performance inverted‐type PSCs are introduced. Compared the conventionally used poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS),...

A highly flexible and transparent conductive electrode based on consecutively stacked layers of polymer (CP) silver nanowires (AgNWs) fully embedded in a colorless polyimide (cPI) is achieved by utilizing an inverted layer‐by‐layer processing method. This CP‐AgNW composite exhibits high transparency >92% at wavelengths 450–700 nm low resistivity 7.7 Ω ◻ −1 , while its ultrasmooth surface provides large contact area for pathways. Furthermore, it demonstrates unprecedentedly flexibility...

Highly efficient solar cells with sustainable performance under severe mechanical deformations are in great demand for future wearable power supply devices. In this regard, numerous studies have progressed to implement flexible architecture high‐performance devices such as perovskite cells. However, the absence of suitable and stretchable materials has been a obstacle replacement largely utilized transparent conducting oxides that limited flexibility. Here, shape recoverable polymer, Noland...

Molecular packing structures and photoinduced charge separation dynamics have been investigated in a recently developed bulk heterojunction (BHJ) organic photovoltaic (OPV) material based on poly(thienothiophene-benzodithiophene) (PTB1) with power conversion efficiency (PCE) of >5% solar cell devices. Grazing incidence X-ray scattering (GIXS) measurements the PTB1:PCBM ([6,6]-phenyl-C(61)-butyric acid methyl ester) films revealed pi-stacked polymer backbone planes oriented parallel to...

We investigated the effects of chemical structures non-fullerene acceptors on photo-stability polymer solar cells.

Reliable integration of organometallic halide perovskite in photovoltaic devices is critically limited by its low stability humid environments. Furthermore, additives to increase the mobility hole transport material (HTM) have deliquescence and hygroscopic properties, which attract water molecules result accelerated degradation devices. In this study, a double cantilever beam (DCB) test used investigate effects HTM layer on through neatly delaminating interface between layers. Using DCB...

We report synthesis and characterizations of two novel series polymers, namely the PBTZ PBIT series. The PBTZ1 polymer was synthesized as a copolymer 4,8-bis(2-butyloctyl)benzo[1,2-b:4,5-b′]dithiophene (BDT) along with 2,5-bis(2-ethylhexyl)-3,6-bisthiazol-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (TzDPP), while PBTZ2 TzDPP 2-(1-butylheptyl)thieno[3,4-d]thiazole (TTz). based on dithienopyrrolobenzothiadiazole (DPBT), BDT also synthesized. polymers showed enhanced ground excited state...

We report a new hole transporting material (HTM) based on [2,2]paracyclophane triarylamine. Due to its higher charge mobility compared with spiro-OMeTAD, the solar cell device incorporating HTM achieved high photovoltaic performance PCE of 17.6%.

The SAM layer which formed hydrogen-bonding to the methylammonium of perovskite induced dipole moments at interface, resulting in energy band bending and increased built-in voltage, consequently, improved charge transfer PSC.

We synthesized a donor polymer of bis(2-ethylhexyl)thiophene-substituted benzodithiophene (BDT-Th) and 1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione, for which the BDT-Th unit includes chlorine sulfur-bridged 2-ethylhexyl in thiophene side group. When compared with PBDB-TF, fluorine BDT-Th, PBDB-TSCl shows more efficient exciton dissociation charge generation, is probably because large dipole moment changes from ground to excited states lead reduced...