Outstanding Photocurrent Density and Incident Photonto- Current Conversion Efficiency of Liquid-State NiO Perovskite-Sensitized Solar Cells

摘要

The efficiency and photocurrent density reported for p-type-sensitized solar cellsup to now are still lagging behind that of the n-type counterparts, limiting thesuccessful development of p–n tandem cells. To circumvent this issue, NiO thinfilm is fabricated by the aerosol-assisted chemical vapor deposition (AACVD)technique and used in p-type solar cells. A systematic study is conducted tocomprehend the correlation between NiO thickness and the power conversionefficiency (PCE) of liquid-state NiO-based sensitized solar cells. By carefullydesigning the cell components, this type of device demonstrates the highestphotocurrent density (J_(sc)) exceeding 18 mA cm~(-2) when using iodine/triiodide asthe redox shuttle matching the one produced by the TiO_2 counterpart. This isaccomplished by 1) using the AACVD technique for the one-step deposition ofcompact and mesoporous NiO electrodes, 2) optimizing the thickness of the NiOlayer through controlling the deposition time, and 3) adopting methylammoniumlead iodide (CH_3NH_3PbI_3) as a light harvester prepared via a sequential depositionmethod.