Abstract

The stability of perovskite solar cells exposed to prolonged solar irradiation is a major concern that has not been thoroughly investigated in the past. In this investigation, devices fabricated with the architecture, glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag using Pb acetate as a source material, were found to operate with an efficiency of about 13%. Adding excess amounts of Pb to the precursor resulted in a presence of Pb in the perovskite (PVS) active layer. In addition, the impact of photo-induced degradation on the device efficiency was investigated. X-ray Diffraction and Time-resolved Photoluminescence analyses were used to evaluate the impact of excess Pb before and after illumination. The results indicate that changes in the crystallinity occur without any significant decrease in charge carrier lifetimes, and this is attributed to the formation of the degradation product, PbI2. This by-product has been shown to have beneficial effects due to its influence in passivating grain boundaries and in altering the band structure at the interface between the active layer and the electron transport layer. This work demonstrates that 5 mol% excess Pb is the optimal concentration with respect to efficiency and stability of these devices. The devices can retain more than 50% of their initial efficiency after 1 h of simulated solar exposure, when compared to 0 mol% and 10 mol% excess Pb samples.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalOrganic Electronics: physics, materials, applications
Volume59
DOIs
StatePublished - Aug 1 2018

Fingerprint

halides
Lead
solar cells
degradation
Degradation
ITO glass
Carrier lifetime
carrier lifetime
ITO (semiconductors)
Charge carriers
Band structure
Perovskite
Byproducts
charge carriers
acetates
crystallinity
Photoluminescence
Grain boundaries
Acetates
grain boundaries

Keywords

  • Lead iodide
  • Methylammonium lead iodide
  • Perovskite
  • Photo-degradation
  • Stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Impact of excess lead on the stability and photo-induced degradation of lead halide perovskite solar cells. / Yerramilli, Aditya S.; Chen, Yuanqing; Sanni, Dahiru; Asare, Joseph; Theodore, N. David; Alford, Terry.

In: Organic Electronics: physics, materials, applications, Vol. 59, 01.08.2018, p. 107-112.

Research output: Contribution to journalArticle

Yerramilli, Aditya S. ; Chen, Yuanqing ; Sanni, Dahiru ; Asare, Joseph ; Theodore, N. David ; Alford, Terry. / Impact of excess lead on the stability and photo-induced degradation of lead halide perovskite solar cells. In: Organic Electronics: physics, materials, applications. 2018 ; Vol. 59. pp. 107-112.
@article{fdc769445bd74c54b0c54d9eb40144f2,
title = "Impact of excess lead on the stability and photo-induced degradation of lead halide perovskite solar cells",
abstract = "The stability of perovskite solar cells exposed to prolonged solar irradiation is a major concern that has not been thoroughly investigated in the past. In this investigation, devices fabricated with the architecture, glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag using Pb acetate as a source material, were found to operate with an efficiency of about 13{\%}. Adding excess amounts of Pb to the precursor resulted in a presence of Pb in the perovskite (PVS) active layer. In addition, the impact of photo-induced degradation on the device efficiency was investigated. X-ray Diffraction and Time-resolved Photoluminescence analyses were used to evaluate the impact of excess Pb before and after illumination. The results indicate that changes in the crystallinity occur without any significant decrease in charge carrier lifetimes, and this is attributed to the formation of the degradation product, PbI2. This by-product has been shown to have beneficial effects due to its influence in passivating grain boundaries and in altering the band structure at the interface between the active layer and the electron transport layer. This work demonstrates that 5 mol{\%} excess Pb is the optimal concentration with respect to efficiency and stability of these devices. The devices can retain more than 50{\%} of their initial efficiency after 1 h of simulated solar exposure, when compared to 0 mol{\%} and 10 mol{\%} excess Pb samples.",
keywords = "Lead iodide, Methylammonium lead iodide, Perovskite, Photo-degradation, Stability",
author = "Yerramilli, {Aditya S.} and Yuanqing Chen and Dahiru Sanni and Joseph Asare and Theodore, {N. David} and Terry Alford",
year = "2018",
month = "8",
day = "1",
doi = "10.1016/j.orgel.2018.04.052",
language = "English (US)",
volume = "59",
pages = "107--112",
journal = "Organic Electronics",
issn = "1566-1199",
publisher = "Elsevier",

}

TY - JOUR

T1 - Impact of excess lead on the stability and photo-induced degradation of lead halide perovskite solar cells

AU - Yerramilli, Aditya S.

AU - Chen, Yuanqing

AU - Sanni, Dahiru

AU - Asare, Joseph

AU - Theodore, N. David

AU - Alford, Terry

PY - 2018/8/1

Y1 - 2018/8/1

N2 - The stability of perovskite solar cells exposed to prolonged solar irradiation is a major concern that has not been thoroughly investigated in the past. In this investigation, devices fabricated with the architecture, glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag using Pb acetate as a source material, were found to operate with an efficiency of about 13%. Adding excess amounts of Pb to the precursor resulted in a presence of Pb in the perovskite (PVS) active layer. In addition, the impact of photo-induced degradation on the device efficiency was investigated. X-ray Diffraction and Time-resolved Photoluminescence analyses were used to evaluate the impact of excess Pb before and after illumination. The results indicate that changes in the crystallinity occur without any significant decrease in charge carrier lifetimes, and this is attributed to the formation of the degradation product, PbI2. This by-product has been shown to have beneficial effects due to its influence in passivating grain boundaries and in altering the band structure at the interface between the active layer and the electron transport layer. This work demonstrates that 5 mol% excess Pb is the optimal concentration with respect to efficiency and stability of these devices. The devices can retain more than 50% of their initial efficiency after 1 h of simulated solar exposure, when compared to 0 mol% and 10 mol% excess Pb samples.

AB - The stability of perovskite solar cells exposed to prolonged solar irradiation is a major concern that has not been thoroughly investigated in the past. In this investigation, devices fabricated with the architecture, glass/ITO/PEDOT:PSS/MAPbI3/PCBM/Ag using Pb acetate as a source material, were found to operate with an efficiency of about 13%. Adding excess amounts of Pb to the precursor resulted in a presence of Pb in the perovskite (PVS) active layer. In addition, the impact of photo-induced degradation on the device efficiency was investigated. X-ray Diffraction and Time-resolved Photoluminescence analyses were used to evaluate the impact of excess Pb before and after illumination. The results indicate that changes in the crystallinity occur without any significant decrease in charge carrier lifetimes, and this is attributed to the formation of the degradation product, PbI2. This by-product has been shown to have beneficial effects due to its influence in passivating grain boundaries and in altering the band structure at the interface between the active layer and the electron transport layer. This work demonstrates that 5 mol% excess Pb is the optimal concentration with respect to efficiency and stability of these devices. The devices can retain more than 50% of their initial efficiency after 1 h of simulated solar exposure, when compared to 0 mol% and 10 mol% excess Pb samples.

KW - Lead iodide

KW - Methylammonium lead iodide

KW - Perovskite

KW - Photo-degradation

KW - Stability

UR - http://www.scopus.com/inward/record.url?scp=85046701528&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046701528&partnerID=8YFLogxK

U2 - 10.1016/j.orgel.2018.04.052

DO - 10.1016/j.orgel.2018.04.052

M3 - Article

AN - SCOPUS:85046701528

VL - 59

SP - 107

EP - 112

JO - Organic Electronics

JF - Organic Electronics

SN - 1566-1199

ER -