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Toshiba’s Transparent Cu2O Tandem Solar Top Cell Achieves 8.4% Efficiency

A boost to development of no-plug charging EVs and transition to renewable energy.

Toshiba Corporation (TOKYO: 6502) today announced that it has successfully raised the power conversion efficiency (PCE) of its transparent Cu2O solar cell to 8.4%, the world’s highest level for a reported Cu2O solar cell(1). With the cell positioned as the top cell over a 25% PCE silicon cell (Cu2O-Si tandem cell), Toshiba estimates that an overall PCE of 27.4% can be achieved, notably above the 26.7% highest PCE reported for any standard silicon cell(2).

Under the test criteria defined by Japan’s New Energy and Industry Technology Development Organization (NEDO), Toshiba estimates that the Cu2O-Si tandem cell will carry an EV 35km without any need of recharging. Looking ahead, Toshiba expects the new cell to boost development of EVs with no need for plug-in charging, and to advance other mobility applications, such as the High Altitude Platform Station (HAPS), the telecom platform in the stratosphere.”

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