The new strategy, employing thiazole as a π bridge into the backbone of quinoid polymers, enhanced the VOC and photovoltaic performance.

Structural phase transformation from multiwalled carbon nanotubes to nanocrystalline diamond by hydrogen plasma post-treatment was carried out. Ultrahigh equivalent diamond nucleation density above 10 11 nuclei/cm 2 was easily obtained. The diamond formation and growth mechanism was proposed to be the consequence of the formation of sp 3 bonded amorphous carbon clusters. The hydrogen chemisorption on curved graphite network and the energy deposited on the carbon nanotubes by continuous impingement of activated molecular or atomic hydrogen are responsible for the formation of amorphous carbon matrix. Diamond nucleates and grows in the way similar to that of diamond chemical vapor deposition processes on amorphous carbon films.

A high-mobility diketopyrrolopyrrole-based copolymer (P) was employed in compact layer free CH3NH3PbI3 perovskite solar cells as a hole-transporting layer (HTL). By using the P-HTL, the 6.62% device efficiency with conventional poly-3-hexylthiophene was increased to 10.80% in the simple device configuration (ITO/CH3NH3PbI3/HTL/MoO3/Ag). With improved short circuit current density, open circuit voltage, and fill factor, the higher power conversion efficiency of P-HTL device is ascribed to the higher carrier mobility, more suitable energy level, and lower interfacial charge recombination. Advantages of applying P-HTL to perovskite solar cells, such as low cost, low-temperature processing, and excellent performance with simple cell structure, exhibit a possibility for commercial applications.

WO3 with surface oxygen vacancies can be used as an excellent anode buffer layer for high performance polymer solar cells.

Metal‐free carbon nanozymes could be promising with the unique features of intrinsic catalytic ability, structure diversity, and strong tolerance to acidic/alkaline media. However, to date, the study of metal‐free carbon nanozymes fell far behind metal‐based nanomaterials, in which, the majority reported much more peroxidase‐like activity than other enzyme‐mimicking behavior (e.g., oxidase). Thus, the exploit of high‐performance carbon nanozymes is of importance but challenging. In this work, the nitrogen‐rich conjugated polymer (Aza‐CPs) with rigid network structure is utilized as precursor to yield N‐doped carbon material QAU‐Z1 in high yield via a direct pyrolysis method. Surprisingly, QAU‐Z1 stood out in oxidase‐like behavior, which significantly outperformed the control materials GNC‐900 and QAU‐Z2 with nucleobase or conjugated small molecule as precursor, respectively. More importantly, it is a crucial revelation that the catalytic performance is closely related to the change of zeta potential for carbon nanozyme during the substrate 3,3′,5,5′‐tetramethylbenzidine oxidation process, as well as its catalytical capacity to O2, which could be insightful to understand the inherent mechanism. This work not only presents the potential of conjugated polymers in constructing highly efficient carbon nanozyme, but also reveals the vital role of interaction mode between the nanozyme and substrate in the catalytic performance.

Compact layer free perovskite solar cell devices with a PCE of up to 9.95% are demonstrated employing a new hole-transport material – PBDTTT-C.

A novel donor-acceptor (D-A) copolymer (P3TBDTDTBT), including hyperconjugated side chained benzodithiophene as a donor and 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DTBT) as an acceptor, was designed and synthesized. Due to the introduction of the hyperconjugated side chain, the resultant polymer exhibited good thermal stability with a high decomposition temperature of 437 C, a low bandgap of 1.67 eV with an absorption onset of 742 nm in the solid film, and a deep highest occupied molecular orbital (HOMO) energy level of À5.26 eV. Finally, the polymer solar cell (PSC) device based on this polymer and [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM) showed the best power conversion efficiency (PCE) of 3.57% with an open-circuit voltage (V oc) of 0.78 V, a short-circuit current density (J sc) of 8.83 mA cm À2 and a fill factor (FF) of 53%.

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