Thinner solar cell layers better resist radiation damage

Solar cells with thinner active layers show greater resistance to the harsh conditions in space, find researchers in Kazakhstan.

The research team from Nazarbayev University has been investigating how variations in active layer thickness influence the stability of organic solar cells by exposing the cells to radiation similar to that experienced in orbit.

They have found that thinner active layers are more tolerant to radiation and exhibit better recovery after thermal annealing. This limits the damage caused by proton radiation. The group attributes this resilience to lower trap formation and enhanced charge extraction.

'Every kilogramme sent into space costs about US$4,000. We tested new, ultra-thin organic materials - and the thinner they are, the better they survive radiation. Less weight, more resilience,' says Professor Viktor Brus.

By optimising active layer thickness, the team aims to enhance solar cell resilience, so they are more viable for long-term space missions.