Science· 2025Q1
Homogenized chlorine distribution for >27% power conversion efficiency in perovskite solar cells
- 493citations
- Q1SCImago
- 2025year
Short summary
Incorporating alkali metal oxalates into perovskite solar cells homogenizes chlorine distribution, suppressing defects and interfacial barriers, leading to a certified 27.2% power conversion efficiency (PCE) and improved stability.
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Key points
- Alkali metal oxalates homogenize chlorine distribution in perovskite films by binding chloride ions.
- This homogenization suppresses surface defects and eliminates interfacial barriers.
- A certified steady-state power conversion efficiency (PCE) of 27.2% was achieved.
- Devices retained 86.3% of initial PCE after 1529 hours of continuous MPPT under 1 Sun.
- Unpassivated devices maintained 82.8% of original PCE after 1000 hours of MPPT at 85°C under 1 Sun.
AI-generated from the title and abstract; the full text is not read.
Abstract
The spatial heterogeneity of halogen distribution in perovskite thin films represents a critical factor currently limiting both the power conversion efficiency and stability of solar cells. We identified pronounced through-film inhomogeneity in chlorine distribution in formamidinium lead iodide films, with the generally used additive methylammonium chloride. We demonstrated that incorporating alkali metal oxalates could effectively homogenize the chlorine distribution. These compounds underwent thermal dissociation, releasing alkali metal cations that selectively bound chloride ions, which considerably suppressed surface defects and eliminated interfacial barriers. A certified steady-state power conversion efficiency (PCE) of 27.2% (device area and measured mask area: 0.108 square cm and 0.074 square cm, respectively) in perovskite solar cells was achieved, and devices retained 86.3% of their initial PCE after 1529 hours of continuous maximum power point tracking (MPPT) under 1 Sun condition. Moreover, the unpassivated device maintained 82.8% of its original PCE under MPPT at 85°C aging under 1 Sun illumination after 1000 hours.
The authors' abstract, as published at the source. Science, 2025 · DOI ↗
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Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering