Surface Passivation with Diaminopropane Dihydroiodide for p‐i‐n Perovskite Solar Cells with Over 25% Efficiency

Abstract

At present, one of the major factors limiting the further improvement of inverted (p‐i‐n) perovskite solar cells (PSCs) is trap‐assisted non‐radiative recombination at the perovskite/electron transporting layer (ETL) interface. Surface passivation with organic ammonium salt is a powerful strategy to improve the performance of PSCs. Herein, an effective method by using propylamine hydroiodide (PAI) and 1,3‐diaminopropane dihydroiodide (PDADI) is reported to modify the perovskite/ETL interface. These two ammonium salts do not form new perovskite but directly passivate the defects on the perovskite surface after annealing. The results show that the PDADI‐modified perovskite films possess a lower surface defect density and less non‐radiative recombination as well as improved charge carrier transport. Based on this strategy, the PDADI‐modified p‐i‐n PSCs deliver an impressive efficiency of 25.09% (certified 24.58%) with an open‐circuit voltage of 1.184 V. Furthermore, the unencapsulated PDADI‐modified PSCs also exhibit good storage stability, retaining 91% of initial PCE at 65 °C in a N2 glove box for 1300 h. This strategy provides an efficient route to fabricate highly efficient and stable inverted p‐i‐n structured PSCs.

Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications

“…The shunt resistance values ( R sh ) for CsMAFA devices were found to be independent of substrate type, in contrast with the RP devices where devices on flexible substrates show significantly higher R sh than the glass-based RP devices, suggesting better diode quality for the former. Although the devices studied in this work have PV performance that is lower than record efficiencies reported for rigid and flexible p-i-n PSCs, they were fabricated using methods and materials suitable for translation to R2R fabrication on low-cost PET substrates under an ambient processing condition. We have previously reported on the scalability of these processes, and the performance achieved herein is comparable to those reports, ,, with the flexible RP-based PSCs in the present work displaying the highest PCE reported to date .…”

Achieving a high-quality active film through surface passivation to enhance the stability of inverted perovskite solar cells

“…Therefore, surface engineering plays a pivotal role in achieving highly efficient and stable devices. 40…”

Additive engineering via multiple-anchoring enhances 2D perovskite solar cells’ performance

“…In comparison with the control device ( n id = 1.91 kT q −1 ), the TEMPIC-treated PSCs device shows a reduced n id value of 1.78 kT q −1 . Observed higher α and lower n id values in the TEMPIC-treated 2D device illustrates the effective suppression of the non-radiative charge carrier recombination in the device, 33 which helps to improve the photovoltaic performances of the PSCs.…”