Heterojunction Doping of Poly(triarylamine) with Cesium-Doped Vanadium Oxide via Interfacial Electron Transfer toward High-Performance Perovskite Solar Cells

Abstract

As an alternative to the traditional blend casting method, a novel heterojunction doping approach is developed to dope hole extraction layers (HELs) for greatly boosting the efficiency of charge carrier collection in perovskite solar cells (PSCs). The HELs are prepared by sequential deposition of Cs-doped VO x and poly­(triarylamine) (PTAA) thin films, and extensive heterojunction doping is observed in the contact interface between the two thin films due to the presence of electron transfer from PTAA to Cs-doped VO x . The interfacial doping in the Cs-doped VO x /PTAA HELs enhances their conductivity and improves their energy level alignment. These increase V OC, J SC, FF, and power conversion efficiency (PCE) in PSCs compared to those in the PSCs with the use of Cs-doped VO x and PTAA separately.

Advances in Cellulose-Based Composites for Energy Applications

“…Solar energy is an inexhaustible resource with vast potential as the cleanest and sustainable energy source for electricity generation [ 75 , 130 ]. While photovoltaic technologies have made great strides in recent years, significant advances are still needed to enable these technologies to be economically and technically viable, as well as environmentally friendly from a life-cycle perspective.…”

Metal oxide charge transporting layers for stable high-performance perovskite solar cells

“…[214][215][216][217][218][219] Furthermore, a few of them have been used as buffer layers or interface modifiers in NiO X HTLs for ordered perovskite growth, with larger grain sizes and fewer defects, to achieve better stability and efficiency of solar cells. 220,221 In another report, the application of molecules with high electron affinity in the metal oxide HTL helped in the efficient extraction of holes, which may result in improved performance of solar cells. For this purpose, a novel F2HCNQ with high electron affinity was introduced into the NiO X HTL, resulting in an improved PCE of 22.13%.…”

“…233 A heterojunction of Cs-doped VO X and poly(triarylamine) (PTAA) was developed for interfacial doping and exhibited a better PCE of ∼19.64%. 221 Surface passivation. Surface treatments can influence the electrical properties of different metal oxides by tuning the density and distribution of surface defects.…”

“…233 A heterojunction of Cs-doped VO X and poly(triarylamine) (PTAA) was developed for interfacial doping and exhibited a better PCE of ∼19.64%. 221…”