Low-Temperature, Solution-Processed MoO_x for Efficient and Stable Organic Solar Cells

Abstract

Sol-gel processed MoO(x) (sMoO(x)) hole-extraction layers for organic solar cells are reported. A Bis(2,4-pentanedionato)molybdenum(VI)dioxide/isopropanol solution is used and only a moderate thermal post deposition treatment at 150 °C in N(2) ambient is required to achieve sMoO(x) layers with a high work-function of 5.3 eV. We demonstrate that in P3HT:PC(60)BM organic solar cells (OSCs) our sMoO(x) layers lead to a high filling factor of about 65% and an efficiency of 3.3% comparable to that of reference devices with thermally evaporated MoO(3) layers (eMoO(3)). At the same time, a substantially improved stability of the OSCs compared to devices using a PEDOT:PSS hole extraction layer is evidenced.

Interfacial degradation effects of aqueous solution-processed molybdenum trioxides on the stability of organic solar cells evaluated by a differential method

“…18,19 Recently, solution-processed transition metal oxides (TMOs), such as Molybdenum oxide (MoO 3 ), Vanadium oxide (V 2 O 5 ), Germanium dioxide (GeO 2 ), and nickel oxide (NiO), have been widely used in OSCs for avoiding the acidic nature of the aqueous PEDOT:PSS dispersions. [20][21][22][23][24][25][26][27][28][29] As predicted, most TMO-based OSCs exhibited prolonged lifetime compared to those PEDOT:PSS based devices. However, the detailed degradation mechanisms related to the hole interfacial layer are not yet well understood.…”

“…Zilberberg et al also reported that a solution-processable MoO x based OSCs show dramatically improved stability and after 30 days retain 90% of their initial PCE in N 2 and 84% in air. 26 Different from their work ((based on sol-gel processing), we reported a more simple and environment-friendly processing (aqueous solution-processable route) for depositing MoO 3 film. In present work, the pH value of MoO 3 aqueous solution was about 4, which is higher than that of aqueous PEDOT:PSS dispersions ($1).…”

Metal oxides for interface engineering in polymer solar cells

“…However, to form s-MoO x films to be used for PSCs, the process requires a high annealing temperature ($300 C). Zilberberg et al 89 presented a precursor based on bis (2,4-pentanedionato) molybdenum(VI) dioxide and isopropanol. After annealing in nitrogen at 150 C, a smooth (roughness r.m.s.…”

Ultrafast laser-assisted synthesis of hydrogenated molybdenum oxides for flexible organic solar cells

“…9 Among TMOs, molybdenum oxide (MoO 3 ) is a promising candidate because of its transparency, air stability, and high work function (WF). [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] In the early stages of OSC research, vacuumdeposition was conducted for the fabrication of MoO 3 thin-lms. However, as a large-area and low-cost roll-to-roll (R2R) fabrication has attracted attention for practical applications, a number of attempts have been conducted to obtain solution-processed MoO 3 as a HTL in OSCs.…”