Abstract
•2-(2,2,2-Trifluoroethoxy)aniline (2TFA) is incorporated into the perovskite precursor for achieving high-quality perovskite films. The photovoltaic parameters of the 2TFA modified devices have been improved, with the power conversion efficiency (PCE) increasing from 22.72 % to 24.10 %.•The 'dual site binding mechanism' of 2TFA additive in perovskite is calculated using density functional theory (DFT). The –NH2 of 2TFA molecules form hydrogen bonds with I − and –CF 3 of 2TFA molecules form weak hydrogen bonds with FA + in perovskite through NH…F.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 %
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 %.