Themed collection Perovskites march on

Perovskite-based materials enable solar cells with improved stability and flexibility, which are now considered as the most promising optoelectronic materials for future applications.

Dopants for small molecule-based organic hole-transport layers impact both perovskite solar cells initial performance and long-term stability.

The different synthesis approaches and growth mechanisms of metal halide perovskites will be discussed along with their novel characteristics and applications.

Doping of hole transporting materials typically increases the efficiency of perovskite solar cells but remains questionable for overall device stability.

Perovskite-type metal oxides have been widely investigated and applied in various fields in the past several decades due to their extraordinary variability of compositions and structures with targeted physical and chemical properties (e.g., redox behaviour, oxygen mobility, electronic and ionic conductivity).

Explaining most known double perovskite electronic structures and predicting new ones using Linear Combination of Atomic Orbitals analysis.

We identify the existence of nonlinear optical (NLO) activity in a number of novel ABX₃-type metal-free perovskites, where A is a highly tuneable organic cation, B is a NH₄ cation and X is a halide anion.

A systematic structure–property correlation study was conducted to preliminarily elucidate an inherent regularity governing the structure of dopant-free HTMs.

Strongly confined CsPbBr₃ perovskite nanocrystals exhibit sub-ps hot exciton relaxation dynamics and the absence of a phonon bottleneck.

The development of low-dimensional perovskite micro/nanostructures with high water stability for novel photonic/electronic applications is highly desirable.

Aqueous acid-based synthesis of lead-free tin halide perovskites with near-unity photoluminescence quantum efficiency and high chemical yield is described.

Picosecond hole transfer and microsecond charge-separated states were observed at the perovskite nanocrystal/tetracene interface, which are leveraged to demonstrate the dissociation of up to 5.6 excitons per nanocrystal by multi-hole transfer.

Molecular hole-transporting materials containing a weak electron acceptor core can simultaneously improve the stability and photovoltaic performance of perovskite solar cells.

We introduce a healing effect of graphene preventing carrier trapping by the defects near the surface of metal halide perovskites.

Unreported 2,3-dicyano-fluoranthene was first prepared as an efficient electron-withdrawing building block for constructing D–A type dopant-free hole transporting materials.

A new concept of HTMs for PSCs: a 3D structure with a core of coplanar quinolizino is firstly put forward and demonstrated to be highly effective, and it is derived from the conventional concept of 2D triphenylamine HTM.

Long-term photostability and high performance were achieved by perovskite solar cells with an amino-functionalized conjugated polymer as a new electron transport layer.

Colloidal TlI and TlBr nanocrystals are prepared, which show violet-blue luminescence, high carrier mobility and long diffusion lengths thus suggesting the suppression of deep-trap states.

Evidence for an ultrafast light-induced cascade of energy and charge transfer between aggregated quantum-confined nanoplatelets and nanoparticles of CH₃NH₃PbBr₃ perovskite.

A fluorinated indolo[3,2-b]indole (IDID) derivative is prepared as a crystalline hole transporting material for perovskite solar cells. A fluorinated IDID backbone enables a tight molecular stacking by π–π interaction. The device fabricated using IDIDF exhibits a PCE of 19%.