van der Waals Mixed Valence Tin Oxides for Perovskite Solar Cells as UV-Stable Electron Transport Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 33125246.
- Also identified by DOI 10.1021/acs.nanolett.0c03286.
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Abstract
Stable electron transport materials (ETMs) with fewer surface defects and proper energy level alignments with halide perovskite active layers are required for efficient perovskite solar cells (PSCs) with long-term durability. Here, two-dimensional van der Waals mixed valence tin oxides Sn<sub>2</sub>O<sub>3</sub> and Sn<sub>3</sub>O<sub>4</sub> are controllably synthesized and applied as ETMs for planar PSCs. The synthesized Sn<sub>2</sub>O<sub>3</sub> and Sn<sub>3</sub>O<sub>4</sub> have size of 5-20 nm and disperse well in water as stable colloids for months. Both Sn<sub>2</sub>O<sub>3</sub> and Sn<sub>3</sub>O<sub>4</sub> exhibit typical n-type semiconductor energy band structures, low trap density, and suitable energy level alignments with halide perovskites. Steady-state power conversion efficiencies (PCEs) of 22.36% and 21.83% are obtained for Sn<sub>2</sub>O<sub>3</sub>-based and Sn<sub>3</sub>O<sub>4</sub>-based planar PSCs. In addition, the half cells without hole transport materials and back electrodes show good UV-stability with average PCE of 99.0% and 95.7% for Sn<sub>2</sub>O<sub>3</sub>-based and Sn<sub>3</sub>O<sub>4</sub>-based devices remaining after 1000 h of ultraviolet soaking with an intensity of 70 mW cm<sup>-2</sup>.