講演情報
[10a-PB1-20]Energy-Level Alignment and Defect Passivation Effects of Dual-Functional Hole-Transporting Materials for Reduced Non-Radiative Losses in Inverted Perovskite Solar Cells
〇Wen-Ren Li2, Yogesh S. Tingare1, Chaochin Su1 (1.N Taipei Univ. Tech., 2.N Central Univ.)
キーワード：
hole-transporting materials、donor-acceptor-donor、donor-acceptor-acceptor
The performance of perovskite solar cells (PSCs) is largely governed by interfacial processes, particularly at the interfaces between the perovskite and hole-transporting materials (HTMs). Small-molecule HTMs are particularly important due to their structural tunability enhancing device durability. This work shows the rational design of asymmetric small-molecule HTMs with donor-acceptor-donor (D-A-D: DKO) and donor-acceptor-acceptor (D-A-A: DKCN) features. Both HTMs are based on a carbazole core which serves a dual function by modulating the energy level through its electron-withdrawing functionality and enabling strong coordination with undercoordinated Pb2+ ions for defect passivation. The D–A–D-configured DKO delivers superior PSC performance compared with the D–A–A-configured DKCN, owing to its higher hole mobility and more favorable energy-level alignment. The optimized DKO-based PSC achieves a power conversion efficiency (PCE) of 22.85%, driven by enhanced photocurrent generation and suppressed non-radiative recombination losses. These results highlight the effectiveness of a dual-function molecular design strategy that simultaneously enables defect passivation and efficient charge transport, providing a clear route toward highly efficient and durable PSCs. More broadly, this strategy offers a versatile platform for the rational design of advanced interfacial materials for next-generation photovoltaic technologies.