Lead-Free Tin Perovskite Solar Cells Achieve 16.2% Efficiency with Intrinsic Environmental Robustness

September 13, 2026

University of Wisconsin–Madison (news release) USA

Overview

Researchers at the University of Wisconsin–Madison have engineered tin-based perovskite solar cells with intrinsic protection against oxygen and moisture, achieving a 16.2% power-conversion efficiency. This represents one of the highest efficiencies for tin perovskites, demonstrating enhanced durability without compromising performance. Published in Nature Materials, this breakthrough offers a crucial design strategy for developing robust, non-toxic solar materials for future energy applications.

In Depth

Background

Lead-halide perovskite solar cells have demonstrated remarkable efficiencies, but concerns regarding lead toxicity and stability issues in humid environments hinder their widespread adoption. Tin-based perovskites offer a promising lead-free alternative but have historically struggled with lower efficiencies and poor environmental stability due to the easy oxidation of Sn²⁺ to Sn⁴⁺.

Key Findings

A collaborative team from the University of Wisconsin–Madison has successfully developed a novel tin-based perovskite solar cell that addresses these critical stability challenges. Their design incorporates inherent protection mechanisms against oxygen and moisture, which are typically detrimental to perovskite performance. These lead-free cells achieved a power-conversion efficiency of 16.2%, a significant milestone that ranks among the highest reported for tin perovskite solar cells. Crucially, this enhanced durability was achieved without any compromise on the device’s photovoltaic performance. The research, published in the prestigious journal Nature Materials, details the material engineering strategies employed to achieve this robust performance.

Significance & Outlook

This breakthrough provides a vital new design strategy for creating robust and non-toxic solar materials. By demonstrating high efficiency coupled with intrinsic environmental protection, these tin-based perovskites pave the way for more sustainable and commercially viable next-generation solar technologies. The ability to withstand environmental degradation opens up possibilities for broader applications and accelerates the shift towards safer, high-performance photovoltaic devices, potentially reducing reliance on lead-containing materials in solar energy production.

Source: https://www.greenprophet.com/2026/09/scientists-make-lead-free-perovskite-solar-cells-that-can-weather-the-elements/

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