Charge Extraction Via Graded Doping of Hole Transport Layers Gives Highly Luminescent and Stable Metal Halide Perovskite Devices

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2019 Feb 23

PMID 30793032

Citations 7

Authors

Mojtaba Abdi-Jalebi

M Ibrahim Dar

Satyaprasad P Senanayak

Aditya Sadhanala

Zahra Andaji-Garmaroudi

Luis M Pazos-Outon

Johannes M Richter

Andrew J Pearson

Henning Sirringhaus

Michael Gratzel

Richard H Friend

Affiliations

Soon will be listed here.

Abstract

One source of instability in perovskite solar cells (PSCs) is interfacial defects, particularly those that exist between the perovskite and the hole transport layer (HTL). We demonstrate that thermally evaporated dopant-free tetracene (120 nm) on top of the perovskite layer, capped with a lithium-doped Spiro-OMeTAD layer (200 nm) and top gold electrode, offers an excellent hole-extracting stack with minimal interfacial defect levels. For a perovskite layer interfaced between these graded HTLs and a mesoporous TiO electron-extracting layer, its photoluminescence yield reaches 15% compared to 5% for the perovskite layer interfaced between TiO and Spiro-OMeTAD alone. For PSCs with graded HTL structure, we demonstrate efficiency of up to 21.6% and an extended power output of over 550 hours of continuous illumination at AM1.5G, retaining more than 90% of the initial performance and thus validating our approach. Our findings represent a breakthrough in the construction of stable PSCs with minimized nonradiative losses.

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