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Interfacial Engineering with One-Dimensional Lepidocrocite TiO2-Based Nanofilaments for High-Performance Perovskite
Shrabani Panigrahi1, Hussein O Badr2, Jonas Deuermeier1
1i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology, and CEMOP/UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal.
ACS Omega
|January 1, 2025
Summary
Interface engineering with novel lepidocrocite TiO2 nanofilaments significantly enhances perovskite solar cell efficiency and stability. This cost-effective method reduces recombination, leading to higher power conversion efficiencies and long-term performance.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Interface engineering is crucial for optimizing perovskite solar cells (PSCs), aiming to reduce nonradiative recombination losses for improved efficiency and stability.
- Current PSC development seeks hysteresis-free devices with enhanced longevity.
Purpose of the Study:
- To introduce a novel interface modification strategy for PSCs using one-dimensional lepidocrocite TiO2-based nanofilaments (1DLs).
- To enhance the efficiency, stability, and reduce recombination in PSCs via interface engineering.
Main Methods:
- Fabrication of 1DL TiO2 nanofilaments from cost-effective, earth-abundant precursors.
- Integration of 1DLs as an interface layer between mesoporous TiO2 and halide perovskite films in PSCs.
- Characterization of device performance, including power conversion efficiency (PCE) and stability under ambient conditions, supported by photoluminescence analysis.
Main Results:
- 1DL deposition promoted larger perovskite grain size and a more compact perovskite layer.
- Minimized trap centers and reduced charge recombination, confirmed by photoluminescence.
- Achieved an improved average PCE from 13 ± 3.2% to 16 ± 1.8%, with a champion PCE of 17.82%.
- Demonstrated enhanced stability, with 1DL-containing PSCs retaining ~87% of initial efficiency after 120 days.
Conclusions:
- 1DL TiO2 nanofilaments offer a cost-effective and novel material for cathode interface engineering in PSCs.
- This approach effectively improves PSC efficiency and long-term stability without encapsulation.
- The study presents a promising strategy for developing high-performance, stable perovskite solar cells.
