Transparent Ultrathin Metal Electrode with Microcavity Configuration for Highly Efficient TCO-Free Perovskite Solar Cells.

Fengqin He,Xueyi Li,He Xi,Chunfu Zhang,Jincheng Zhang,Hailong You,Shangzheng Pang,Dazheng Chen

doi:10.3390/ma13102328

Abstract

Optical microcavity configuration is one optical strategy to enhance light trapping in devices using planar electrodes. In this work, the potential application of optical microcavity configuration with ultrathin metal electrodes in highly efficient perovskite solar cells (PSCs) was investigated. By comparing with the device with conventional indium-tin-oxide (ITO) electrodes, it is shown that by carefully designing the Ag/dielectric planar electrode, a device with an optical microcavity structure can achieve comparable—or even higher—power conversion efficiency than a conventional device. Moreover, there is a relative high tolerance for the Ag film thickness in the optical microcavity structure. When the thickness of the Ag film is increased from 8 to 12 nm, the device still can attain the performance level of a conventional device. This gives a process tolerance to fabricate devices with an optical microcavity structure and reduces process difficulty. This work indicates the great application potential of optical microcavities with ultrathin metal electrodes in PSCs; more research attention should be paid in this field.

Highlights

Organolead halide perovskites have attracted extensive interest due to their outstanding optoelectronic properties such as tunable compositions, high absorption coefficient, low exciton binding energy, balanced ambipolar carrier transport, long charge carrier diffusion length, solution processing and cost effectiveness [1,2,3,4,5,6,7,8,9]
We will show that optical microcavity configuration with the ultrathin metal electrode is still an effective strategy to enhance the device performance in perovskite solar cells (PSCs) and more research attention should be paid in this field
We investigate the potential use of the optical microcavity with the ultrathin metal electrode in PSCs

Summary

Introduction

Organolead halide perovskites have attracted extensive interest due to their outstanding optoelectronic properties such as tunable compositions, high absorption coefficient, low exciton binding energy, balanced ambipolar carrier transport, long charge carrier diffusion length, solution processing and cost effectiveness [1,2,3,4,5,6,7,8,9]. Optical microcavity structure could satisfy high device performance, is always the pursuit of the research field. Optical microcavity structure this requirement [14,15,16]. By using metal/dielectric structure, the optical microcavity configuration with the ultrathin metal electrode has been used in organic solar cells and achieves promising device performance [33]. We will show that optical microcavity configuration with the ultrathin metal electrode is still an effective strategy to enhance the device performance in PSCs and more research attention should be paid in this field

Theory and Method

Discussion

D1 on the ITOITO electrode is

Conclusions