All-Inorganic Perovskite Solar Cells Based on CsPbIBr2 and Metal Oxide Transport Layers with Improved Stability.

Jien Yang,Haifa Zhai,Mingjian Yuan,Ruiping Qin,Jinjin Xu,Qiong Zhang,Hairui Liu,Songhua Chen

doi:10.3390/nano9121666

Jien Yang, Haifa Zhai + Show 6 more

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https://doi.org/10.3390/nano9121666

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Abstract

Despite the successful improvement in the power conversion efficiency (PCE) of perovskite solar cells (PSCs), the issue of instability is still a serious challenge for their commercial application. The issue of the PSCs mainly originates from the decomposition of the organic–inorganic hybrid perovskite materials, which will degrade upon humidity and suffer from the thermal environment. In addition, the charge transport layers also influence the stability of the whole devices. In this study, inorganic transport layers are utilized in an inverted structure of PSCs employing CsPbIBr2 as light absorbent layer, in which nickel oxide (NiOx) and cerium oxide (CeOx) films are applied as the hole transport layer (HTL) and the electron transport layer (ETL), respectively. The inorganic transport layers are expected to protect the CsPbIBr2 film from the contact of moisture and react with the metal electrode, thus preventing degradation. The PSC with all inorganic components, inorganic perovskite and inorganic transport layers demonstrates an initial PCE of 5.60% and retains 5.56% after 600 s in ambient air at maximum power point tracking.

Highlights

The solar cells adopting organic–inorganic hybrid perovskite as absorber have obtained significant attention in the field of photovoltaics, with an unprecedented rise in power conversion efficiency (PCE) from 3.8% to 25.2% in a few years [1]
The CsPbIBr2 have emerged as a better candidate among its cousins, because of its capacity to balance the bandgap and its thermal stability [7], which has a bandgap of 2.05 eV, promising a potential highest PCE about 17.5% according to the Shockley–Queisser limit [8] and the material is unexpectedly stable with a melting point more than 460 ◦C under ambient atmosphere [9]
The prepared perovskite solar cells with a configuration of ITO/nickel oxide (NiOx)/CsPbIBr2/cerium oxide (CeOx)/Ag based on an all-metal-oxide charge transport layer and the all-inorganic perovskite material shows 5.60% efficiency and significantly improved stability compared to those reported [17,18]

Summary

Introduction

The solar cells adopting organic–inorganic hybrid perovskite as absorber have obtained significant attention in the field of photovoltaics, with an unprecedented rise in power conversion efficiency (PCE) from 3.8% to 25.2% in a few years [1]. The higher performance PSCs usually have a sandwich structure, in which the perovskite active layer is placed between a hole transport layer (HTL) and an electron transport layer (ETL). We use cerium oxide (CeOx) as electron transport layers with in situ decomposition from its precursor at low temperature (100 ◦C) and nickel oxide (NiOx) as hole transport layers from pre-prepared NiOx nanoparticles solution as well as CsPbIBr2 perovskite as the photoactive layer in the device. The prepared perovskite solar cells with a configuration of ITO/NiOx/CsPbIBr2/CeOx/Ag based on an all-metal-oxide charge transport layer and the all-inorganic perovskite material shows 5.60% efficiency and significantly improved stability compared to those reported [17,18]

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