Performance improvement of inverted polymer solar cells with different top electrodes by introducing a MoO3 buffer layer

Abstract

Molybdenum trioxide ͑MoO 3 ͒ was inserted between the active layer and top electrode in inverted polymer solar cells ͑PSCs͒ with nanocrystalline titanium dioxide as an electron selective layer. The performances of structurally identical PSCs with different top electrodes ͑Au, Ag, and Al͒ were investigated and compared. The interface between MoO 3 and different metals was studied by x-ray photoelectron spectroscopy. The results showed that the performances of devices with different metals are greatly improved due to the incorporation of MoO 3 and the open-circuit voltage of devices is relatively insensitive to the choice of the anode metal when MoO 3 is introduced.

Effects of ultraviolet soaking on surface electronic structures of solution processed ZnO nanoparticle films in polymer solar cells

“…Au and MoOx as the top anode. 15,16 In addition, the inverted structure also matches well with the vertical phase separation of the active bulk heterojunction layer and thus enhances charge collection at the organic/electrode interfaces. 17,18 Solution processed ZnO nanoparticle (ZnONP) layers are widely used as cathodes for the inverted polymer solar cells 19,20 and n-type side of the recombination layer in tandem architectures 21,22 due to comparatively high electron conductivity, low work function, transparency and environmental stability.…”

Role of tungsten oxide in inverted polymer solar cells

“…9,10 An alternative approach is to reverse the device architecture and hence to form inverted PSCs, in which MoO 3 and V 2 O 5 were usually inserted between the active layer and top electrode. 11,12 In this letter, we introduce a low-cost, nontoxic, and easily evaporable tungsten oxide ͑WO 3 ͒ as a holeextraction layer in inverted PSCs with nanocrystalline titanium dioxide ͑nc-TiO 2 ͒ as an electron selective layer. The device architecture is shown schematically in Fig.…”

“…12 After a cleaning step, TiO 2 -sol was spin coated on ITO-coated glass substrates at 3000 rpm. Then the samples were moved to a muffle furnace and annealed at 450°C for 2 h. After annealing treatment, a͒ Author to whom correspondence should be addressed.…”

The Advanced Charge Injection Techniques Towards the Fabrication of High-Power Organic Light Emitting Diodes

“…It is considered by some groups that MoO3 should act as a hole conductor with highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of 5.4 eV and 2.3 eV, respectively [32]. Recently, however, it is suggested [33] that due to being doped by oxygen vacancy defects MoO3 intrinsically offers n-typed conduction with deep-lying HOMO and LUMO levels of 9.7 eV and 6.7 eV, respectively.…”