Intramolecular noncovalent interactions (INIs) have served as ap owerfuls trategy for accessing organic semiconductors with enhanced charge transport properties.Herein, we apply the INI strategy for developing dopant-free holetransporting materials (HTMs) by constructing two smallmolecular HTMs featuring an INI-integrated backbone for high-performance perovskite solar cells (PVSCs). Upon incorporating noncovalent S•••O interaction into their simplestructured backbones,t he resulting HTMs,B TORA and BTORCNA, showed self-planarized backbones,t uned energy levels,enhanced thermal properties,appropriate film morphology,a nd effective defect passivation. More importantly,t he high film crystallinity enables the materials with substantial hole mobilities,t hus rendering them as promising dopant-free HTMs.C onsequently,t he BTORCNA-based inverted PVSCs delivered ap ower conversion efficiency of 21.10 %w ith encouraging long-term device stability,o utperforming the devices based on BTRA without S•••O interaction (18.40 %). This work offers ap ractical approach to designing charge transporting layers with high intrinsic mobilities for highperformance PVSCs.

No abstract

Self-assembling peptides have shown tremendous potential in the fields of material sciences, nanoscience, and medicine. Because of the vast combinatorial space of even short peptides, identification of self-assembling sequences remains a challenge. Herein, we develop an experimental method to rapidly screen a huge array of peptide sequences for self-assembling property, using the one-bead one-compound (OBOC) combinatorial library method. In this approach, peptides on beads are N-terminally capped with nitro-1,2,3-benzoxadiazole, a hydrophobicity-sensitive fluorescence molecule. Beads displaying self-assembling peptides would fluoresce under aqueous environment. Using this approach, we identify eight pentapeptides, all of which are able to self-assemble into nanoparticles or nanofibers. Some of them are able to interact with and are taken up efficiently by HeLa cells. Intracellular distribution varied among these non-toxic peptidic nanoparticles. This simple screening strategy has enabled rapid identification of self-assembling peptides suitable for the development of nanostructures for various biomedical and material applications.

Intramolecular noncovalent interactions (INIs) have served as ap owerfuls trategy for accessing organic semiconductors with enhanced charge transport properties.Herein, we apply the INI strategy for developing dopant-free holetransporting materials (HTMs) by constructing two smallmolecular HTMs featuring an INI-integrated backbone for high-performance perovskite solar cells (PVSCs). Upon incorporating noncovalent S•••O interaction into their simplestructured backbones,t he resulting HTMs,B TORA and BTORCNA, showed self-planarized backbones,t uned energy levels,enhanced thermal properties,appropriate film morphology,a nd effective defect passivation. More importantly,t he high film crystallinity enables the materials with substantial hole mobilities,t hus rendering them as promising dopant-free HTMs.C onsequently,t he BTORCNA-based inverted PVSCs delivered ap ower conversion efficiency of 21.10 %w ith encouraging long-term device stability,o utperforming the devices based on BTRA without S•••O interaction (18.40 %). This work offers ap ractical approach to designing charge transporting layers with high intrinsic mobilities for highperformance PVSCs.

It has been known that twin symmetry occurs in small metal crystals and it could lead to ultrahigh mechanical properties. In this research, we first found out the formation of nanoscale twin crystals in polymers under cylindrical confinement. The nylon-6 nanorods are fabricated by infiltrating the melt into cylindrical nanopores of an anodized alumina oxide template. The α-phase nanotwin of nylon-6 under cylindrical confinement has been examined by both two-dimensional wide-angle X-ray diffraction and transmission electron microscopy (TEM) selected-area electron diffraction (SAED) techniques. The 45°angle between two 200 reflections in the TEM SAED pattern of individual nylon-6 nanorods precisely confirms that nanocrystals in the nylon-6 rod are twins. The twin axis is along the a-axis orientation, which is also the hydrogen-bond direction of the unit cell. The (001) composition (twin) plane is the hydrogen-bonded sheet.