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

Abstract

The instability of perovskite materials under continuous ultraviolet (UV) light irradiation and high sensitivity in humid environments remain obstacles to future commercialization. Especially, the photovoltaic performance of perovskite solar cells (PVSCs) is prone to decline under UV light exposure for sustained periods of time. However, in conventional methods, preventing UV light from entering PVSCs usually comes at the expense of reducing short circuit photocurrent (J sc ). Herein, the UV stability of PVSCs is modified by introducing a singlet fission down-conversion layer 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN) via one-step anti-solvent method without sacrificing device efficiency. The introduction of down conversion layer can not only improve the J sc by converting UV light into multiple excitons, but also enhance the open-circuit voltage (V oc ) owing to a better matched energy level alignment at the perovskite/spiro-OMeTAD interface. Consequently, the TIPS-PEN incorporated PVSCs attain the champion power conversion efficiency (PCE) up to 22.92% accompanied with dramatically increased UV photostability which can retain 80% of its primitive PCE under continuous UV light soaking for 150 h. Moreover, the unencapsulated PVSCs with TIPS-PEN exhibit remarkable moisture stability which can sustain over 80% of the initial value under air conditions (50% relative humidity, 25 °C) after 1000 h.

Synergistic Passivation and Down‐Conversion by Imidazole‐Modified Graphene Quantum Dots for High Performance and UV‐Resistant Perovskite Solar Cells

“…More converted photons reach perovskite layer, leading to a higher photocurrent, which is one of the reasons for the significant increase in J SC . [54] Subsequently, to elucidate the significant contribution of the DC effect and optimized film quality to the UV stability of films and devices, the accelerated UV aging test of perovskite films on SnO 2 and SnO 2 /IGQDs substrates is performed. It is noted that the UV light is incident from the glass side.…”

“…More converted photons reach perovskite layer, leading to a higher photocurrent, which is one of the reasons for the significant increase in J SC . [ 54 ]…”

Multifunctional Metal‐Organic Frameworks Capsules Modulate Reactivity of Lead Iodide toward Efficient Perovskite Solar Cells with UV Resistance

“…Currently, apart from photovoltaic performance, the stability of PVSCs is a crucial factor for their commercialization, particularly in terms of UV stability. [51,52] When exposed to UV and O 2 simultaneously, the deterioration of the labile perovskite structure can be catastrophic. The intense absorption of ZIF-8 in the UV region suggests that the ZIF-8@FAI interlayer can serve as a DC layer to protect the PVSCs device (Figure 6a).…”

Facile Modification on Buried Interface for Highly Efficient and Stable FASn0.5Pb0.5I3 Perovskite Solar Cells with NiOx Hole‐Transport layers†

“…[ 1‐5 ] In the past decade, the power conversion efficiency (PCE) of single‐junction PSCs has rapidly developed from 3.8% to the certified 25.8% in 2023. [ 6‐15 ] These prominent achievements are usually made from lead‐based perovskites (PVKs). [ 16 ] However, their inevitable toxicity and environmental unfriendliness have triggered the exploration of lead‐free or lead‐less PSCs.…”