Colloidally prepared La-doped BaSnO ₃ electrodes for efficient, photostable perovskite solar cells

Abstract

Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO) as an electron-transporting layer. However, TiO can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500°C. We report a superoxide colloidal solution route for preparing a LBSO electrode under very mild conditions (below 300°C). The PSCs fabricated with LBSO and methylammonium lead iodide (MAPbI) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.

Aqueous‐Containing Precursor Solutions for Efficient Perovskite Solar Cells

“…It is notable that the device efficiency became stable after 100 h of test and as a result, the PCE maintains about 50% of the original value after 800 h of continuous light irradiation. Encouragingly, the aqueous‐containing precursor devices exhibit similar performance and lifetime with state‐of‐the‐art perovskite cells using TiO 2 mesoporous scaffolds,2 indicating that the aqueous‐containing precursor process could become a commercially competitive technique. For the anhydrous‐precursor device (Figure 5b), while the FF increases by about 10%, the V OC similarly shows an obvious reduction to less than 80% and offset the increase of FF.…”

“…Perovskite solar cells have emerged as competitive solution‐processed candidates for photovoltaic applications due to the demonstration of high power conversion efficiency (PCE), ease of fabrication, and low materials cost 1, 2, 3, 4, 5, 6, 7, 8, 9. The efficiency of perovskite solar cells has rapidly risen from 3.8% to over 22.1% just within the past several years 10, 11.…”

CsPbCl3‐Driven Low‐Trap‐Density Perovskite Grain Growth for >20% Solar Cell Efficiency

“…Organic–inorganic lead halide perovskite (PVK), with its outstanding photophysical properties and versatility in low‐temperature solution processes,1, 2, 3, 4, 5, 6, 7, 8 is considered one of the most promising materials for thin‐film solar cells 9, 10, 11. In just the few years since its invention, the power conversion efficiency (PCE) of the organic–inorganic hybrid PVK solar cell (PSC) based on mixed cations and halides has been rapidly increased to as high as 22.7% 12, 13, 14…”

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

“…Nowadays, with many scientific issues being explored around M-PSCs, the pursuit of further photovoltaic improvement is imperative. Electron transfer in PSCs, including both interfacial extraction and transport, is fundamental photophysical kinetic process that is implemented for electron transfer layer (ETL) and is crucial to device performance [8][9][10][11].…”