Functionalized sp Carbon-Conjugated Covalent Organic Frameworks for Interfacial Modulation of Inverted Perovskite Solar Cells.

Interfacial modulation utilizing functional materials is proven to be crucial for obtaining high photovoltaic performance in lead halide perovskite solar cells (PSCs). This study investigates, for the first time, the utilization of a pyrene-based sp carbon-conjugated covalent organic framework (spc-COF) as an interfacial layer in inverted PSCs. Functionalized with cyano (-CN) Lewis base groups, the spc-COF exhibits a dual effect, simultaneously passivating both the NiO and the perovskite layers.

Solvent-Templated Methylammonium-Based Ruddlesden-Popper Perovskites with Short Interlayer Distances.

Two-dimensional (2D) halide perovskites are exquisite semiconductors with great structural tunability. They can incorporate a rich variety of organic species that not only template their layered structures but also add new functionalities to their optoelectronic characteristics. Here, we present a series of new methylammonium (CHNH or MA)-based 2D Ruddlesden-Popper perovskites templated by dimethyl carbonate (CHOCOOCH or DMC) solvent molecules.