MXene-Embedded PEDOT:PSS Hole-Transport Material for Lead-Free Perovskite Solar Cells
JinKiong Ling, Daniele T. Cuzzupè, Muhammad Faraz Ud Din, Anastasiia Stepura, Tom Burgard, Yekitwork Abebe Temitmie, E. Majková, Mária Omastová, Rajan Jose, Lukas Schmidt‐Mende, Azhar Fakharuddin
Abstract
High Resolution Image Download MS PowerPoint Slide Improving the energy alignment between charge-transport layers and the perovskite is crucial for further enhancing the photovoltaic performance of tin-based perovskite solar cells (PSCs). Herein, the role of Ti 3 C 2 T x MXene in a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer (HTL) on the photovoltaic properties of PSCs is investigated as a function of its concentration. An improved perovskite film formation with reduced pinhole density and a more uniform contact potential difference is noted when MXene is embedded in the PEDOT:PSS HTL. The work function of the HTL is increased according to photoelectronic measurements, leading to a favorable energy alignment with the HOMO of PEA 0.2 FA 0.8 SnI 3 perovskite. PSCs fabricated using a MXene-embedded PEDOT:PSS HTL delivered a power conversion efficiency (PCE) of 8.35% compared to 7.35% from the pristine counterpart, while retaining ∼90% of its initial PCE after 450 h of storage in a N 2 atmosphere.