Efficient lead-free perovskite solar cells enabled by polymer induced trap passivation for FASnI3 layer

Tin-based perovskites with excellent optoelectronic properties are promising candidates for fabricating efficient lead-free perovskite solar cells (PSCs). Unfortunately, Tin-based PSCs exhibited a low efficiency, which mainly arises from serious traps-induced non-radiative recombination, leading into large energy loss with a low voltage. Herein, the polymer poly(ethylene glycol) diacrylate (PEGDA) is employed as a template-agent in FASnI
3
to control nucleation and growth is reported. This FASnI
3
layer showed a compact crystal with large grain size and reduced defects. As a result, the fabricated planar heterojunction device of ITO/PEDOT:PSS/FASnI
3
/PC
61
BM/BCP/Ag showed the power conversion efficiency (PCE) of 6.29% with voltage of 0.45 V.