It depends, the efficiency isn't the only parameter. Plants are beloved and self sustained, there are plants that have been alive for thousands of years. Even w

It depends, the efficiency isn't the only parameter. Plants are beloved and self sustained, there are plants that have been alive for thousands of years. Even when the plants die, they can be useful and are naturally recycled. Also, they are able to grow to enormous sizes with the materials available on site, and although it can create challenges plants are desired in most environments. Our advanced high efficiency devices are cool but the ultimate solar devices can be something with many characteristics of the plants.