Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2

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Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2. / Kim, Jung Kyu; Chai, Sung Uk; Ji, Yongfei; Levy-Wendt, Ben; Kim, Suk Hyun; Yi, Yeonjin; Heinz, Tony F.; Nørskov, Jens K.; Park, Jong Hyeok; Zheng, Xiaolin.

In: Advanced Energy Materials, Vol. 8, No. 29, 1801717, 2018.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

Harvard

Kim, JK, Chai, SU, Ji, Y, Levy-Wendt, B, Kim, SH, Yi, Y, Heinz, TF, Nørskov, JK, Park, JH & Zheng, X 2018, 'Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2', Advanced Energy Materials, vol. 8, no. 29, 1801717. https://doi.org/10.1002/aenm.201801717

APA

Kim, J. K., Chai, S. U., Ji, Y., Levy-Wendt, B., Kim, S. H., Yi, Y., ... Zheng, X. (2018). Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2. Advanced Energy Materials, 8(29), [1801717]. https://doi.org/10.1002/aenm.201801717

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Kim, Jung Kyu ; Chai, Sung Uk ; Ji, Yongfei ; Levy-Wendt, Ben ; Kim, Suk Hyun ; Yi, Yeonjin ; Heinz, Tony F. ; Nørskov, Jens K. ; Park, Jong Hyeok ; Zheng, Xiaolin. / Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2. In: Advanced Energy Materials. 2018 ; Vol. 8, No. 29.

Bibtex

@article{5d22bc893e5044849d1c6f657771d5eb,
title = "Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2",
abstract = "To further increase the open-circuit voltage (V oc) of perovskite solar cells (PSCs), many efforts have been devoted to doping the TiO2 electron transport/selective layers by using metal dopants with higher electronegativity than Ti. However, those dopants can introduce undesired charge traps that hinder charge transport through TiO2, so the improvement in the V oc is often accompanied by an undesired photocurrent density–voltage (J–V) hysteresis problem. Herein, it is demonstrated that the use of a rapid flame doping process (40 s) to introduce cobalt dopant into TiO2 not only solves the J–V hysteresis problem but also increases the V oc and power conversion efficiency of both mesoscopic and planar PSCs. The reasons for the simultaneous improvements are two fold. First, the flame-doped Co-TiO2 film forms Co-Ov (cobalt dopant-oxygen vacancy) pairs and hence reduces the number density of Ti3+ trap states. Second, Co doping upshifts the band structure of TiO2, facilitating efficient charge extraction. As a result, for planar PSCs, the flame doping of Co increases the efficiency from 17.1{\%} to 18.0{\%} while reducing the hysteresis from 16.0{\%} to 1.7{\%}. Similarly, for mesoscopic PSCs, the flame doping of Co increases the efficiency from 18.5{\%} to 20.0{\%} while reducing the hysteresis from 7.0{\%} to 0.1{\%}.",
keywords = "Cobalt-doped TiO, Electron transport layer, Hysteresis, Perovskite solar cells, Sol-flame doping",
author = "Kim, {Jung Kyu} and Chai, {Sung Uk} and Yongfei Ji and Ben Levy-Wendt and Kim, {Suk Hyun} and Yeonjin Yi and Heinz, {Tony F.} and N{\o}rskov, {Jens K.} and Park, {Jong Hyeok} and Xiaolin Zheng",
year = "2018",
doi = "10.1002/aenm.201801717",
language = "English",
volume = "8",
journal = "Advanced Energy Materials",
issn = "1614-6832",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "29",

}

RIS

TY - JOUR

T1 - Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2

AU - Kim, Jung Kyu

AU - Chai, Sung Uk

AU - Ji, Yongfei

AU - Levy-Wendt, Ben

AU - Kim, Suk Hyun

AU - Yi, Yeonjin

AU - Heinz, Tony F.

AU - Nørskov, Jens K.

AU - Park, Jong Hyeok

AU - Zheng, Xiaolin

PY - 2018

Y1 - 2018

N2 - To further increase the open-circuit voltage (V oc) of perovskite solar cells (PSCs), many efforts have been devoted to doping the TiO2 electron transport/selective layers by using metal dopants with higher electronegativity than Ti. However, those dopants can introduce undesired charge traps that hinder charge transport through TiO2, so the improvement in the V oc is often accompanied by an undesired photocurrent density–voltage (J–V) hysteresis problem. Herein, it is demonstrated that the use of a rapid flame doping process (40 s) to introduce cobalt dopant into TiO2 not only solves the J–V hysteresis problem but also increases the V oc and power conversion efficiency of both mesoscopic and planar PSCs. The reasons for the simultaneous improvements are two fold. First, the flame-doped Co-TiO2 film forms Co-Ov (cobalt dopant-oxygen vacancy) pairs and hence reduces the number density of Ti3+ trap states. Second, Co doping upshifts the band structure of TiO2, facilitating efficient charge extraction. As a result, for planar PSCs, the flame doping of Co increases the efficiency from 17.1% to 18.0% while reducing the hysteresis from 16.0% to 1.7%. Similarly, for mesoscopic PSCs, the flame doping of Co increases the efficiency from 18.5% to 20.0% while reducing the hysteresis from 7.0% to 0.1%.

AB - To further increase the open-circuit voltage (V oc) of perovskite solar cells (PSCs), many efforts have been devoted to doping the TiO2 electron transport/selective layers by using metal dopants with higher electronegativity than Ti. However, those dopants can introduce undesired charge traps that hinder charge transport through TiO2, so the improvement in the V oc is often accompanied by an undesired photocurrent density–voltage (J–V) hysteresis problem. Herein, it is demonstrated that the use of a rapid flame doping process (40 s) to introduce cobalt dopant into TiO2 not only solves the J–V hysteresis problem but also increases the V oc and power conversion efficiency of both mesoscopic and planar PSCs. The reasons for the simultaneous improvements are two fold. First, the flame-doped Co-TiO2 film forms Co-Ov (cobalt dopant-oxygen vacancy) pairs and hence reduces the number density of Ti3+ trap states. Second, Co doping upshifts the band structure of TiO2, facilitating efficient charge extraction. As a result, for planar PSCs, the flame doping of Co increases the efficiency from 17.1% to 18.0% while reducing the hysteresis from 16.0% to 1.7%. Similarly, for mesoscopic PSCs, the flame doping of Co increases the efficiency from 18.5% to 20.0% while reducing the hysteresis from 7.0% to 0.1%.

KW - Cobalt-doped TiO

KW - Electron transport layer

KW - Hysteresis

KW - Perovskite solar cells

KW - Sol-flame doping

U2 - 10.1002/aenm.201801717

DO - 10.1002/aenm.201801717

M3 - Journal article

VL - 8

JO - Advanced Energy Materials

JF - Advanced Energy Materials

SN - 1614-6832

IS - 29

M1 - 1801717

ER -