[16p-K405-1~14] 12.5 有機・ハイブリッド太陽電池

15:30 〜 15:45奨励賞エントリー英語発表

[16p-K405-10] Self-Assembled Monolayer assisted Energy level alignment of the Ideal Band Gap Tin-Lead perovskite solar cells

〇(P)Safalmani Pradhan¹, Gaurav Kapil¹, Ajay Kumar Baranwal¹, Suraya Shaban¹, Qing Shen¹, Shuzi Hayase¹ (1.UEC-Tokyo)

キーワード：

perovskite solar cells、Tin-Lead perovskite、Self-Assembled Monolayer

Within a short time of 15 years, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) have increased from 3.8% to 26.08%, thus approaching the PCE of commercial silicon solar cells. However, the most efficient PSCs reported are based on lead (Pb)-based perovskites, which have a bandgap of 1.5–1.7 eV. According to the Shockley–Queisser (SQ) limit, single-junction solar cells with an ideal band gap of 1.4 eV possesses the highest theoretical PCE limit of ~33%. However, PEDOT: PSS, one of the most widely used hole transport material (HTM) suffers from acidic and hygroscopic characteristics that can severely compromise the stability of the devices. Also, the inherent absorption characteristics of PEDOT: PSS limits the solar cell’s short-circuit current density. In this context, self-assembled monolayers (SAMs) of organic molecules have been considered as a valid alternative to conventional HTMs used. SAMs allows the modulation of the work function (WF) of a metal oxide, in order to align it with the energy level of the photo-excited quasi-Fermi levels of the perovskite layer. However, due to energy level mismatch between the widely used SAMs, such as, 2PACz, MeO-2PACz etc, and the ideal band gap Tin-Lead (Sn-Pb) perovskite, the overall PCE in hampered. In this work we have used an organic molecule, i.e., 4-nitrophenyl boronic acid (4-NPBA) capable of forming a hole-selective contact on the metal oxide surface.