Ferrocene Interlayer for a Stable and Gap-Free P3HT-Based Perovskite Solar Cell as a Low-Cost Power Source for Indoor IoTs

• DOI: 10.1021/acsphotonics.4c01469
• Publication Date: 2025-01-15T17:07:03Z
• Authors: Chaowaphat Seriwa...; Somboon Sahasithiwat; Thana Chotchuangc...; Ladda Srathongsian; Worawat Wattanathana; Zhijun Ning; Napan Phuphathana...; Patawee Sakata; Ko Ko Shin Thant; Thunrada Sukwiboon; Anuchytt Inna; Thanawat Kanlayap...; Anusit Kaewprajak; Pisist Kumnorkaew; Ratchadaporn Supr...; Thipusa Wongpinij; Hideki Nakajima; Duangmanee Wongra...; Pasit Pakawatpanurut; Pipat Ruankham; Pongsakorn Kanjan...
• Keywords: Open-circuit voltage

Although poly(3-hexylthiophene-2,5-diyl) (P3HT) with its stability-boosting hydrophobic surface is a promising low-cost alternative dopant-free hole transport material for n-i-p perovskite solar cells (PSCs), the P3HT-based PSCs suffer from energy mismatch between hydrophilic and P3HT, which results in interlayer gap, poor electronic contact, charge extraction. In this study, ferrocene (Fc) acts as an at perovskite/P3HT interface, inducing replacement of edge-on stacking alkyl side chains π–π thiophene rings within P3HT structure to mitigate such mismatch. With optimal amount Fc, average PCE 23.6% has been achieved under indoor light 1000 lux comparison 20.6% without Fc. addition, unencapsulated device can retain 80% initial (T80) over 12 months dark 70% RH, longer than T80 8 Finally, Bluetooth sensor module powered by three Fc-passivated connected series demonstrate capacity replacing batteries used Internet Things (IoTs).