Efficiency enhancement of perovskite solar cells through fast electron extraction: The role of graphene quantum dots

Zonglong Zhu; Jiani Ma; Zilong Wang; Cheng Mu; Zetan Fan; Lili Du; Yang Bai; Louzhen Fan; He Yan; David Lee Phillips; Shihe Yang

doi:10.1021/ja4132246

Efficiency enhancement of perovskite solar cells through fast electron extraction: The role of graphene quantum dots

Zonglong Zhu
, Jiani Ma
, Zilong Wang
, Cheng Mu
, Zetan Fan
, Lili Du
, Yang Bai
, Louzhen Fan^*
, He Yan
, David Lee Phillips
, Shihe Yang

^*Corresponding author for this work

Hong Kong University of Science and Technology
The University of Hong Kong
Beijing Normal University

Research output: Contribution to journal › Article › peer-review

748 Citations (Scopus)

Abstract

We report on a significant power conversion efficiency improvement of perovskite solar cells from 8.81% to 10.15% due to insertion of an ultrathin graphene quantum dots (GQDs) layer between perovskite and TiO₂. A strong quenching of perovskite photoluminescence was observed at ∼760 nm upon the addition of the GQDs, which is pronouncedly correlated with the increase of the IPCE and the APCE of the respective cells. From the transient absorption measurements, the improved cell efficiency can be attributed to the much faster electron extraction with the presence of GQDs (90-106 ps) than without their presence (260-307 ps). This work highlights that GQDs can act as a superfast electron tunnel for optoelectronic devices.

Original language	English
Pages (from-to)	3760-3763
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	136
Issue number	10
DOIs	https://doi.org/10.1021/ja4132246
Publication status	Published - 12 Mar 2014
Externally published	Yes

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abstract = "We report on a significant power conversion efficiency improvement of perovskite solar cells from 8.81\% to 10.15\% due to insertion of an ultrathin graphene quantum dots (GQDs) layer between perovskite and TiO2. A strong quenching of perovskite photoluminescence was observed at ∼760 nm upon the addition of the GQDs, which is pronouncedly correlated with the increase of the IPCE and the APCE of the respective cells. From the transient absorption measurements, the improved cell efficiency can be attributed to the much faster electron extraction with the presence of GQDs (90-106 ps) than without their presence (260-307 ps). This work highlights that GQDs can act as a superfast electron tunnel for optoelectronic devices.",

author = "Zonglong Zhu and Jiani Ma and Zilong Wang and Cheng Mu and Zetan Fan and Lili Du and Yang Bai and Louzhen Fan and He Yan and Phillips, \{David Lee\} and Shihe Yang",

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doi = "10.1021/ja4132246",

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T1 - Efficiency enhancement of perovskite solar cells through fast electron extraction

T2 - The role of graphene quantum dots

AU - Zhu, Zonglong

AU - Ma, Jiani

AU - Wang, Zilong

AU - Mu, Cheng

AU - Fan, Zetan

AU - Du, Lili

AU - Bai, Yang

AU - Fan, Louzhen

AU - Yan, He

AU - Phillips, David Lee

AU - Yang, Shihe

PY - 2014/3/12

Y1 - 2014/3/12

N2 - We report on a significant power conversion efficiency improvement of perovskite solar cells from 8.81% to 10.15% due to insertion of an ultrathin graphene quantum dots (GQDs) layer between perovskite and TiO2. A strong quenching of perovskite photoluminescence was observed at ∼760 nm upon the addition of the GQDs, which is pronouncedly correlated with the increase of the IPCE and the APCE of the respective cells. From the transient absorption measurements, the improved cell efficiency can be attributed to the much faster electron extraction with the presence of GQDs (90-106 ps) than without their presence (260-307 ps). This work highlights that GQDs can act as a superfast electron tunnel for optoelectronic devices.

AB - We report on a significant power conversion efficiency improvement of perovskite solar cells from 8.81% to 10.15% due to insertion of an ultrathin graphene quantum dots (GQDs) layer between perovskite and TiO2. A strong quenching of perovskite photoluminescence was observed at ∼760 nm upon the addition of the GQDs, which is pronouncedly correlated with the increase of the IPCE and the APCE of the respective cells. From the transient absorption measurements, the improved cell efficiency can be attributed to the much faster electron extraction with the presence of GQDs (90-106 ps) than without their presence (260-307 ps). This work highlights that GQDs can act as a superfast electron tunnel for optoelectronic devices.

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JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 10

ER -

Efficiency enhancement of perovskite solar cells through fast electron extraction: The role of graphene quantum dots

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