Efficient and stable planar heterojunction perovskite solar cells with an MoO₃/PEDOT:PSS hole transporting layer

Abstract

PSS are demonstrated in the optimized device due to the incorporation of an MoO3 layer.

Stability Issues on Perovskite Solar Cells

“…The TTF-1 based device without additives showed a slower degradation rate compared to the device with the additive contained spiro-MeOTAD and maintained ~80% of its initial PCE for 500 h under a relative humidity of ~40%. Other HTMs were also fabricated and used in PSCs, such as amine derivatives [47], oligothiophene derivative [48], and MoO3/PEDOT:PSS [49]. These HTMs were proposed as potential candidates for long-term stable materials for PSCs.…”

Research Update: Strategies for improving the stability of perovskite solar cells

“…86 To prevent direct contact between the corrosive PEDOT:PSS and the transparent electrode, thin inorganic blocking layers were proposed. 87,88 Such bilayer structures of PEDOT:PSS and the buffer layer were reported to experience less of a performance decrease than pristine PEDOT:PSS. 87,88 The thin interlayer of CuAlO 2 and MoO 3 are credited, respectively, with suppressing corrosion of the transparent indium-tin oxide (ITO) electrode by the acidic PEDOT:PSS.…”

“…87,88 Such bilayer structures of PEDOT:PSS and the buffer layer were reported to experience less of a performance decrease than pristine PEDOT:PSS. 87,88 The thin interlayer of CuAlO 2 and MoO 3 are credited, respectively, with suppressing corrosion of the transparent indium-tin oxide (ITO) electrode by the acidic PEDOT:PSS. 87,88 In a similar vein, to mitigate this electrode corrosion, GeO 2 was blended into the PEDOT:PSS dispersion prior to its deposition.…”

“…87,88 The thin interlayer of CuAlO 2 and MoO 3 are credited, respectively, with suppressing corrosion of the transparent indium-tin oxide (ITO) electrode by the acidic PEDOT:PSS. 87,88 In a similar vein, to mitigate this electrode corrosion, GeO 2 was blended into the PEDOT:PSS dispersion prior to its deposition. The reasoning was that GeO 2 due to its alkaline nature in aqueous solutions may be able to buffer the acidity of PEDOT:PSS to mitigate any ITO corrosion.…”

High-efficiency perovskite solar cells improved with low-cost orthorhombic Cu2ZnSnS4 as the hole-transporting layer

“…6 Different types of hole-transport materials (HTMs) such as poly(triarylamine)(PTAA), poly (3-hexylthiophee-2,5-diyl(P3HT), poly[2,6-(4,4-bis(2-ethylhexyl)-4Hcyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-be nzothiadiazole)(PCPDTBT), spiro-OMeTAD, poly (3-hexylthiophene-2,5-diyl) (P3HT), 4-(diethylamino)-benzaldehyde diphenylhydrazone (DEH), MoO 3 and CuSCN were developed to fabricate perovskite-solar-cell devices. [7][8][9][10] Organic HTMs called spiro-OMeTAD and PTAA have been widely used and achieved a PCE reaching 20.54 %. However, these materials are easy to degrade and expensive for fabricating solar cells because of their complicated synthetic procedures and highpurity requirement.…”