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The emission of light in two-dimensional (2-D) layered hybrid organic lead halide perovskites, namely (R-NH3)2PbX4, can be effectively tuned using specific building blocks for the perovskite formation. Herein this behaviour is combined with a non-covalent graphene functionalization allowing excellent selectivity and spatial resolution of the perovskite film growth, promoting the formation of hybrid 2-D perovskite : graphene heterostructures with uniform coverage of up to centimeter scale graphene sheets and arbitrary shapes down to 5 μm. Using cryo-Raman microspectroscopy, highly resolved spectra of the perovskite phases were obtained and the Raman mapping served as a convenient spatially resolved technique for monitoring the distribution of the perovskite and graphene constituents on the substrate. In addition, the stability of the perovskite phase with respect to the thermal variation was inspected in situ by X-ray diffraction. Finally, time-resolved photoluminescence characterization demonstrated that the optical properties of the perovskite films grown on graphene are not hampered. Our study thus opens the door to smart fabrication routes for (opto)-electronic devices based on 2-D perovskites in contact with graphene with complex architectures.

Queer Theory by definition is difficult to capture, but it is best understood as the theoretical discourse that upends our assumptions that serve to undergird oppressive structures of power, beginning with a focus on those assumptions that reinforce heteronormativity and harmful gender norms. Queer Theory seeks to uncover and undermine hidden agendas, assumptions, categories, traditions, and norms that support the status quo. Queer Theory is not only antinormative, but also looks to empower disenfranchised subjects by not only dismantling existing structures of power but creating new avenues of empowerment. Queer Theory looks at how a text “queers” established narratives, that is, how it upends established norms and challenges underlying hierarchies. Reading with Queer Theory does not mean imposing a queer reading onto the text, but asking what is queer about the text or what is it queering. This chapter reads Justin Whitley and Elsa Charretier’s The Unstoppable Wasp as a queer feminist critique of continuity as a convention of mainstream comics.

As comics have received numerous literary awards, found their way into museums, peer-reviewed journals and medical schools, countless academic and non-academic outlets assert the form’s newfound le...

We exploit TiO2 surface functionalization as a tool to induce the crystallization process of CH3NH3PbI3−xClx perovskite thin films resulting in a reduction of the degree of orientation of the (110) crystallographic planes. Notably, the variation of the film crystalline orientational order does not affect the photovoltaic performances of the perovskite-based devices, whose efficiency remains mostly unchanged. Our findings suggest that other factors are more significant in determining the device efficiency, such as the non-homogenous coverage of the TiO2 surface causing charge recombination at the organic/TiO2 interface, defect distribution on the perovskite bulk and at the interfaces, and transport in the organic or TiO2 layer. This observation represents a step towards the comprehension of the perovskite film peculiarities influencing the photovoltaic efficiency for high performance devices.