Highly Efficient Wide Bandgap Perovskite Solar Cells With Tunneling Junction by Self-Assembled 2D Dielectric Layer.
basic_science · Level V
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- Record sourced from PubMed, PMID 39148282.
- Also identified by DOI 10.1002/adma.202402053.
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Abstract
Reducing non-radiative recombination and addressing band alignment mismatches at interfaces remain major challenges in achieving high-performance wide-bandgap perovskite solar cells. This study proposes the self-organization of a thin two-dimensional (2D) perovskite BA<sub>2</sub>PbBr<sub>4</sub> layer beneath a wide-bandgap three-dimensional (3D) perovskite Cs<sub>0.17</sub>FA<sub>0.83</sub>Pb(I<sub>0.6</sub>Br<sub>0.4</sub>)<sub>3</sub>, forming a 2D/3D bilayer structure on a tin oxide (SnO<sub>2</sub>) layer. This process is driven by interactions between the oxygen vacancies on the SnO<sub>2</sub> surface and hydrogen atoms of the n-butylammonium cation, aiding the self-assembly of the BA<sub>2</sub>PbBr<sub>4</sub> 2D layer. The 2D perovskite acts as a tunneling layer between SnO<sub>2</sub> and the 3D perovskite, neutralizing the energy level mismatch and reducing non-radiative recombination. This results in high power conversion efficiencies of 21.54% and 19.16% for wide-bandgap perovskite solar cells with bandgaps of 1.7 and 1.8 eV, with open-circuit voltages over 1.3 V under 1-Sun illumination. Furthermore, an impressive efficiency of over 43% is achieved under indoor conditions, specifically under 200 lux white light-emitting diode light, yielding an output voltage exceeding 1 V. The device also demonstrates enhanced stability, lasting up to 1,200 hours.