16.8% Monolithic all-perovskite triple-junction solar cells via a universal two-step solution process

Junke Wang,Dong Zhang,Martijn M Wienk,René A J Janssen,Kunal Datta,Valerio Zardetto

doi:10.1038/s41467-020-19062-8

Abstract

Perovskite semiconductors hold a unique promise in developing multijunction solar cells with high-efficiency and low-cost. Besides design constraints to reduce optical and electrical losses, integrating several very different perovskite absorber layers in a multijunction cell imposes a great processing challenge. Here, we report a versatile two-step solution process for high-quality 1.73 eV wide-, 1.57 eV mid-, and 1.23 eV narrow-bandgap perovskite films. Based on the development of robust and low-resistivity interconnecting layers, we achieve power conversion efficiencies of above 19% for monolithic all-perovskite tandem solar cells with limited loss of potential energy and fill factor. In a combination of 1.73 eV, 1.57 eV, and 1.23 eV perovskite sub-cells, we further demonstrate a power conversion efficiency of 16.8% for monolithic all-perovskite triple-junction solar cells.

Highlights

Perovskite semiconductors hold a unique promise in developing multijunction solar cells with high-efficiency and low-cost
Tremendous research effort has been made for all-perovskite tandem devices[23,24,25,26,27,28,29], with power conversion efficiency (PCE) up to 24.8% achieved by Tan and co-workers[30]
Through optimization of the interconnecting layers (ICLs) based on fullerene/spatial atomic layer deposition (ALD) (SALD) grown SnO2/PEDOT:PSS, we achieve PCEs of above 19% for monolithic all-perovskite tandem solar cells consisting of 1.73 eV and 1.23 eV absorber layers

Summary

Introduction

Perovskite semiconductors hold a unique promise in developing multijunction solar cells with high-efficiency and low-cost. Based on the development of robust and low-resistivity interconnecting layers, we achieve power conversion efficiencies of above 19% for monolithic all-perovskite tandem solar cells with limited loss of potential energy and fill factor. 37.9% in a six- and triple-junction solar cell, respectively, their intricate and costly deposition processes prohibit large-scale applications[4,12,13] Alternative technologies such as inexpensive organic semiconductors have been exploited for multijunction solar cells[9]. Given the lack of comparably high-performing organic absorber layers over a wide range of bandgaps, suboptimal PCEs of 17.4% for tandem14, 11.6% for a triple cell[15], and 7.6% for a quadruple-junction cell[16] have been reported in such multijunction approach. All-perovskite triple-junction solar cells remain largely unexplored, with only a proof-of-concept 6.7% triple cell demonstrated by Snaith and coworkers[31]

Methods

Results

Conclusion