Additive-assisted passivating by 2-(2,2,2-Trifluoroethoxy)aniline and semitransparent perovskite solar cells Fabricated by thermocompression

Abstract

Perovskite solar cells (PSC) are approaching their theoretical efficiency limit of 33.7 % by rapidly innovating in preparation techniques and device architectural design. Exploiting hot-press-assisted additive engineering strategy to construct semitransparent PSC can maximize the use of sunlight and improve power conversion efficiency (PCE). However, simultaneously passivating the perovskite defects and realizing high-performance semitransparent PSC remains a challenge. In this work, 2-(2,2,2-Trifluoroethoxy)aniline (2TFA) is incorporated into the perovskite precursor for achieving high-quality perovskite films. The introduction of –F and –NH₂ groups within the aromatic ring is based on their crucial usage as key building units for optoelectronic materials to cement their intrinsic properties, such as defect passivation, architectural robustness, as well as to modulate the energy levels matching. The 2TFA modified PSC afford a champion PCE of 24.10 % and sustain 85 % of the initial PCE after storage in ambient air over 600 h. In addition, semitransparent perovskite solar cells (ST-PSC) are prepared using thermocompression technology. The 2TFA modified ST-PSC afford a champion PCE of 14.52 %, average visible light transmittance (AVT) of 5.18 %, and light utilization efficiency (LUE) of 0.75 %.