New energetic indandione based planar donor for stable and efficient organic solar cells

•An energetic indandione based D-π-A planar molecule, H3T-ID is synthesized.•H3T-ID is applied as donor material for bulk-heterojunction organic solar cells (BJH-OSCs)•BHJ-OSC fabricated with H3T-ID:PC61BM (1:2, w/w) displays maximum PCE = ~4.05%•H3T-ID donor drives the reproducible and highly stable fabricated BHJ-OSCs.