Dual‐function interface engineering for efficient perovskite solar cells

Abstract

Interface engineering has been proven a powerful tool to improve performances of the perovskite solar cells (PSCs). Herein, highly π-conjugated graphdiyne (GDY) is employed as an interface linker between the perovskite film and the hole transport layer (HTL). It is found that GDY can significantly suppress the formation of metallic Pb (a detrimental defect), and reduces carrier recombination. The linker can also form π-π stacking interaction with the HTL, and facilitates transport and collection of photogenerated holes. The perovskite/GDY/HTL combination leads to large improvement in both power conversion efficiency (from 19.94% to 22.17%) and device stability. In addition, the GDY is also applied to the 3D/2D PSCs, and an outstanding PCE of 23.42% is achieved.

Recent progress in cathode interlayer materials for non‐fullerene organic solar cells

“…Interestingly, the resulting device displayed the retention of over 90% of its initial PCE due to cross‐linking effect of the c ‐PCBSD thin film that protects the aggregation of ZnO (Figure 13D–F). Composites of carbon nanotubes (CNT) with TiO 2 , 228 graphdiyne (GDY) 229 have been used as an interlayer in perovskite solar cells. Several researchers have explored the impact of CNT with organic and inorganic materials, for example, Lee et al 227 introduced the idea of composites interlayer using alcohol‐soluble polyfluorene (ASP)‐wrapped single‐walled carbon nanotubes (SWNTs) in OSCs.…”

Organic spacer engineering in 2D/3D hybrid perovskites for efficient and stable solar cells

“…In recent years, perovskite solar cells (PSCs) have attracted widespread attention owing to their excellent performance, adjustable band gap, high light absorption coefficient, low exciton binding energy, long carrier life and other properties. 1–8 PSCs have achieved a shocking achievement and the current international certification efficiency has exceeded 25.5%. 9 However, different sensitive environmental factors such as a water and oxygen atmosphere, change of temperature, and ultraviolet light are well known to affect the chemical stability of PSCs.…”

Double‐Side Interface Engineering Synergistically Boosts the Efficiency of Inorganic CsPbIBr2 Perovskite Solar Cells Over 12%

“…The decrease of τ ave strongly suggests that RbAc can effectively accelerate the hole transfer at the perovskite /HTL interface, thus greatly suppressing the carrier recombination. [41] To further assess the trap-defect densities in the CsPbIBr 2 films, the Space Charges Limit Current (SCLC) tests of the electron-only devices with the structure of ITO/SnO 2 /(RbAc)/ perovskite PCBM/Ag and the hole-only devices with the structure of ITO/PEDOT:PSS/perovskite/(RbAc)/spiro-OMeTAD/ Ag are conducted, as shown in Figure 4c-f. Normally, the logarithmic I-V curve displays three distinctive ranges, namely ohmic region (linear) at low voltage, trap filling limit (TFL) region (Log (I) /Log (V) > 3) at medium voltage, and trap-free region (Log (I) /Log (V) ≈ 2) at high voltage.…”

“…The decrease of τ ave strongly suggests that RbAc can effectively accelerate the hole transfer at the perovskite /HTL interface, thus greatly suppressing the carrier recombination. [ 41 ]…”