Abstract:

Recent discoveries have revealed a breakthrough in the photovoltaics (PVs) ! eld usingorganometallic perovskites as light harvesters in the solar cell. The organometal perovskitearrangement is self-assembled as alternate layers via a simple low-cost procedure. Theseorganometal perovskites promise several bene! ts not provided by the separate constituents.This overview concentrates on implementing perovskites in PV cells such that the perovskitelayers are used as the light harvester as well as the hole-conducting component. Eliminatinghole-transport material (HTM) in this solar-cell structure avoids oxidation, reduces costs, andprovides better stability and consistent results. Aspects of HTM-free perovskite solar cellsdiscussed in this article include (1) depletion regions, (2) high voltages, (3) panchromaticresponses, (4) chemical modi! cations, and (5) contacts in HTM-free perovskite solar cells.Elimination of HTM could expand possibilities to explore new interfaces in these solarcells, while over the long term, these uniquely structured HTM-free solar cells could offervaluable bene! ts for future PV and optoelectronics applications.