Over 17.1% or 18.2% Efficiency of Layer-by-Layer All-Polymer Solar Cells via Incorporating Efficient Pt Complexes as Energy Donor Additive

• Published in: ACS materials letters Vol. 6; no. 7; pp. 2964 - 2973
• Main Authors: Zhang, Lu, Zhang, Miao, Ni, Yuheng, Xu, Wenjing, Zhou, Hang, Ke, Shengyi, Tian, Hongyue, Jeong, Sang Young, Woo, Han Young, Wong, Wai-Yeung, Ma, Xiaoling, Zhang, Fujun
• Format: Journal Article
• Language: English
• Published: American Chemical Society 01.07.2024
• ISSN: 2639-4979; 2639-4979
• DOI: 10.1021/acsmaterialslett.4c00848

Layer-by-layer (LbL) all-polymer solar cells (APSCs) are constructed with or without the incorporation of a Pt complex F-Pt as an energy donor additive in the acceptor layer. The power conversion efficiency (PCE) of LbL APSCs can be enhanced from 15.86% to 17.14% through introducing 0.2 wt % F-Pt in the PY-IT layer, originating from the efficient energy transfer from F-Pt to PM6 and PY-IT. The efficient energy transfer from F-Pt to PM6 and PY-IT can be well confirmed from the spectral overlapping between photoluminescence (PL) spectra of F-Pt and absorption spectra of PM6 and PY-IT, as well as the prolonged PL lifetime of PM6 and PY-IT according to the transient time-resolved PL spectra of blend and LbL films. The universality of the F-Pt incorporation strategy can be further confirmed from PBQx-TCl/PY-DT based LbL APSCs, and PCE can be increased from 17.57% to 18.29% by incorporating F-Pt into the PY-DT layer.