Fenggong Wang

TL;DR: It is found that organometal halide perovskites can form both charged and uncharged domain walls due to the flexible orientational order of the organic molecules, and charged domain walls can serve as segregated channels for the motions of charge carriers.

TL;DR: In this paper, the authors survey the history, development and recent progress in understanding the mechanisms of the bulk photovoltaic effect (BPVE), with a focus on the shift current mechanism, an intrinsic BPVE that is universal to all materials lacking inversion symmetry.

TL;DR: In this paper, the electronic properties of doped tungsten oxide (WO3) have been studied using DFT calculations with hybrid functionals, and the effect of substituting W with low-valent Ti, Zr, or Hf ions has been shown to narrow the energy gap by introducing localized occupied states above the valence band and shifting the conduction band minimum upward.

TL;DR: In this article, the authors used hybrid functionals combined with both plane wave and localized basis sets for a systematic study of the structural and electronic properties of all phases of WO3, and found that hybrid functions work at least as well as the standard DFT/GGA functional in predicting lattice constants and equilibrium volumes.

TL;DR: It is found that hybrid halide perovskites give approximately three times larger shift current PV response to near-IR and visible light than the prototypical ferroelectric photovoltaic BiFeO₃.