Ultraflexible Corrugated Monocrystalline Silicon Solar Cells with High Efficiency (19%), Improved Thermal Performance, and Reliability Using Low-Cost Laser Patterning
Flexible solar cells have received a growing attention recently due to their everincreasing range of applications. Here, the development of ultra-flexible, lightweight and highefficiency (19%) monocrystalline silicon solar cells with excellent reliability, mechanical resilience and thermal performance is demonstrated by applying a corrugation method combined with laser-patterning. The flexing mechanism converts large-scale rigid photovoltaic cells with interdigitated back contacts into a
... tacts into a flexible version with a preserved efficiency. The corrugation technique is based on the formation of patterned grooves in the active silicon to achieve ultraflexibility. As a result, islands of silicon with different shapes are obtained which are interconnected through the IBC. Multiple corrugation patterns are studied such as linear, honeycomb and octagonal designs, each resulting in different flexing capability in terms of flexing directionality and minimum bending radius, in addition to providing an atypical appearance with an aesthetic appeal. The corrugation method is shown to improve the thermal dissipation (14.6% lower temperature) and to relieve the thermal mismatch challenge compared to the rigid cells due to the fin-like architecture. Finally, the encapsulation using a transparent polymeric material enables a robust performance of the flexible cells when exposed to different environmental conditions such as acid rain, snow and mechanical shocks.