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research article

High Open Circuit Voltage for Perovskite Solar Cells with S,Si-Heteropentacene-Based Hole Conductors

Dar, M. Ibrahim  
•
Arora, Neha  
•
Steck, Christopher
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November 8, 2018
European Journal Of Inorganic Chemistry

High photovoltage in perovskite solar cells (PSCs) can be achieved by designing new hole transporting materials (HTMs) with relatively deeper energy levels of the highest occupied molecular orbital (HOMO). Here, we report on the synthesis of a new heteroacene-based HTM (HTM-1) and demonstrate its potential in the fabrication of FAPbBr(3) [FA = CH(NH2)(2)] PSCs yielding V-OC as high as 1.55 V, a record value for this light harvester. The energetic position of the frontier orbitals of HTM-1 was estimated using electrochemical measurements, and the charge transport across the interfaces was studied using steady-state and time-resolved photoluminescence. When spiro-OMeTAD (HOMO = -5.1 eV) is replaced with HTM-1 (HOMO = -5.3 eV), the V-OC increases from 1.51 to 1.55 V, whereas the J(SC) value decreases from 7.0 to 5.7 mA cm(-2). The similar trade-off between J(SC) and V-OC is observed for efficient iodide-based PSCs, suggesting that there is a critical energy level for the HOMO below which overall photovoltaic performance will suffer. After probing at a maximum power point under full-sun illumination at 60 degrees C for a duration of 120 h, the FAPbBr(3) PSCs based on HTM-1 retained approximate to 95 % of their initial efficiency, which demonstrates their robust operational stability.

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Type
research article
DOI
10.1002/ejic.201800680
Web of Science ID

WOS:000449533700008

Author(s)
Dar, M. Ibrahim  
•
Arora, Neha  
•
Steck, Christopher
•
Mishra, Amaresh
•
Alotaibi, Mohammad Hayal
•
Baeuerle, Peter
•
Zakeeruddin, Shaik Mohammed  
•
Gratzel, Michael  
Date Issued

2018-11-08

Publisher

WILEY-V C H VERLAG GMBH

Published in
European Journal Of Inorganic Chemistry
Issue

41

Start page

4573

End page

4578

Subjects

Chemistry, Inorganic & Nuclear

•

Chemistry

•

perovskites

•

solar cells

•

photovoltage

•

s,si-heteropentacene

•

lead bromide perovskite

•

organometal halide perovskites

•

transport materials

•

high photovoltage

•

layers

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
December 13, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/152376
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