Lightweight Monolithic Microcell CPV for Space

Concentrating photovoltaics (CPV) can increase the efficiency and reduce the cost of photovoltaic power in space. We introduce a new monolithic, ultrathin, and lightweight CPV paradigm based on a transfer-printed microscale solar cell array. In our reflective design, the microcell array is embedded in a radiation-tolerant glass optic that delivers 83% optical efficiency with a $\pm mathbf{77} ^{circ}$ acceptance angle at $32 \times$ geometric gain. The system is $<1$ mm thick and capable of achieving a specific power density of 352 W/kg using state-of-the-art triple junction microcells.