Publication date: 16th July 2025
Perovskite solar cells are now reaching highest power conversion efficiencies above 27%, very closely approaching the performance records of silicon-based devices. However, to combat reach market competitiveness and climate change by large scale deployment, solar cell lifetimes are equally important. Currently, research labs face a range of practical obstacles that hinder gaining a profound understanding of device degradation, which is essential to optimize perovskite solar cells for highest operational lifetimes: The devices must be aged under operational conditions mimicking outdoor conditions. This requires actively adjusting the electrical operation point by maximum power point (MPP) tracking for every solar cell. Moreover, research-scale perovskite solar cells are typically hand-made, displaying significant deviations in process conditions and performance. This necessitates simulated ageing of statistically significant large numbers of samples at maximum power point. Commercial MPPT systems are still relatively expensive, and most research laboratories are limited to a few MPP-channels – if those tools exist at all. What the research community now needs are available solutions for high throughput ageing to perform large ageing campaigns
We have developed an ultra-low-cost maximum power point tracking (MPPT) system at a cost for the electronics parts below 5€ per solar cell channel. We have made this system (PCB layout and air-tight measurement holder design) publicly available on Github for all interested research groups to use. The system is modularly scalable. Our first prototype setup consisted of 112 channels. In our latest setup, we are currently carrying out long-term MPPT ageing campaigns of up to 256 cells in parallel. In our contribution, will introduce the key system components, discuss challenges of the electronics and system integration, and show results and degradation analysis of MPPT ageing of perovskite solar cells.
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