Scientists led by Switzerland’s École Polytechnique Fedérale de Lausanne (EPFL) demonstrated a simple approach to designing the interface between two layers in a perovskite solar cell, which was shown to improve both the performance and stability of the device. Solar cells fabricated by the group achieved 23.4% conversion efficiency, and were operated for close to 6,000 hours before degrading beyond 80% of this initial value.

The research is described in full in the paper Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics, published in Energy & Environmental Science. The cells reached an initial efficiency of 23.4%. After 1,440 hours under continuous one-sun illumination, the unencapsulated cells had retained 87% of their initial performance value. Control samples produced without the additional passivation had lost more than 60% of their initial performance after 600 hours of illumination.

After an initial ‘burn in’ performance loss of around 8% over the first 50 hours, which EPFL says is a common feature of perovskite solar cells, the devices lost only another 5% over the next 1350 hours. By tracking the performance after the burn in period, the group showed that the device could operate for 5950 hours before degrading beyond 80% of its initial performance.

Source: pv-magazine

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