Targeted Management of Perovskite Film by Co(II) Sulfophenyl Porphyrin for Efficient and Stable Solar Cells^†

Abstract

Comprehensive Summary In the lead halide perovskite solar cells (PSCs), the redox reaction of I– and Pb2+ ions in perovskite materials under the fabrication and operation processes causes the formation of defects to destroy the cell efficiency and long‐term stability. Herein, we have employed a Co(II) sulfophenyl porphyrin (CoTPPS) to modify the perovskite film. The sulfonic group could coordinate with Pb2+ to efficiently passivate the uncoordinated Pb2+. Additionally, Co2+ ions in CoTPPS could react with I2 generated under the thermal and light stress to yield the Co3+ and I–, thus achieving the regeneration of I– in perovskite film. Therefore, the CoTPPS could realize the targeted management of the imperfections in perovskite film. As a result, the modified PSCs reveal the remarkably enhanced cell performance. More importantly, the CoTPPS modified device retains 75% of its initial efficiency value storing at 85°C for 2000 h and about 70% of its efficiency when being continuously illuminated at a simulated sunlight for 1200 h. This strategy tackles the chemical reaction and inhibits the defect generation, thus improving the operational stability and efficiency of PSCs.

Highly Stable Perovskite Solar Cells by Reducing Residual Water‐Induced Decomposition of Perovskite

“…Compared with the device without SH, low R tr and high R rec were observed for Pero‐SC with SH, indicating that charge carrier recombination was significantly reduced. [ 73 ] This result indicates that SH can effectively reduce trap‐associated nonradiative recombination and enlarge the driving force for charge carrier separation and transport, finally improving the V OC and J SC of Pero‐SCs. The J ‐ V curves measured in the dark (Figure S15 in SI) also show that the reverse leakage current density was reduced by three orders of magnitude upon the addition of SH, which provides additional evidence for the suppressed nonradiative recombination.…”

Improving Ultraviolet Stability of Perovskite Solar Cells via Singlet Fission Down‐Conversion†

“…The Nyquist plots (Figure S11) of the control and TIPS‐PEN modified devices show different single semicircle, which signifies the charge recombination resistance ( R rec ) value. [ 57 ] The larger semicircle represents the increase in R rec after TIPS‐PEN incorporation, indicating that the recombination of charge carriers is restrained.…”

Metal‐Organic Framework Materials in Perovskite Solar Cells: Recent Advancements and Perspectives

“…In addition, the organic linkers of MOF materials establish coordination with Pb 2+ , I − , and other groups in the perovskite, thereby influencing its crystallization. [53][54][55] This section reviews aforementioned aspect based on the recent studies performed in this direction.…”