Presentation Information
[10a-PB1-6]Ionization-Responsive Self-Assembled Hole-Transport Materials for the Application of High-Performance Inverted Perovskite Solar Cells
〇Chaochin Su1, Yogesh S. Tingare1, Wen-Ren Li2 (1.N Taipei Univ. Tech., 2.N Central Univ.)
Keywords:
perovskite solar cell,hole-transporting materials,donor acceptor donor
Self-assembled monolayers (SAMs), with adjustable molecular structures and energy levels, spontaneously form highly ordered and compact layers and have emerged as promising Hole-transporting materials (HTMs) for perovskite solar cells (PSCs). Two SAM-based HTMs, XYC106 and XYC108, were developed for high-efficiency PSC applications. Both HTMs are based on a carbazole core and feature a donor–acceptor–donor architecture. A key molecular design strategy involved converting the acid moieties of XYC106 into ionic salt groups in XYC108, thereby enhancing device stability, open-circuit voltage, and electrostatic binding affinity. The UV–vis absorption and transmission spectra of XYC106 and XYC108 thin films which demonstrate excellent transparency, with transmittance values over 95% across the 400–850 nm range. The high transparency of HTMs to both minimize parasitic absorption and maximize photon harvesting, is important for inverted PSCs, because the perovskite absorber is deposited on top of the HTM. The J–V curves and the IPCE spectra were acquired for inverted PSCs using XYC106 and XYC108 as HTMs. Results show that the device incorporating XYC106 achieved a power conversion efficiency (PCE) of 18.29%, with an Voc of 1.02 V, a Jsc of 22.37 mA/cm², and a FF of 80.12%. Conversion of the acid moiety to its corresponding salt (XYC108) further improved device performance. The XYC108-based device achieved a PCE of 20.27%, a Voc of 1.10 V, a Jsc of 22.88 mA/cm², and an FF of 80.19%. The ionic HTM XYC108 exhibits higher hole mobility and lower interfacial resistance than the non-ionic HTM XYC106. The XYC108-based PSC achieved an improvement of more than 2 percentage points over the XYC106-based PSC. This enhanced performance is attributed to the increased Jsc, higher Voc, and reduced recombination losses. These results demonstrate that the ionization of SAM-based HTMs improves interfacial properties, thereby enabling the realization of highly efficient inverted PSCs.