Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites

Weijun Ke, Constantinos C. Stoumpos, Ioannis Spanopoulos, Lingling Mao, Michelle Chen, Michael R Wasielewski, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Tin-based perovskites have very comparable electronic properties to lead-based perovskites and are regarded as possible lower toxicity alternates for solar cell applications. However, the efficiency of tin-based perovskite solar cells is still low and they exhibit poor air stability. Here, we report lead-free tin-based solar cells with greatly enhanced performance and stability using so-called "hollow" ethylenediammonium and methylammonium tin iodide ({en}MASnI3) perovskite as absorbers. Our results show that en can improve the film morphology and most importantly can serve as a new cation to be incorporated into the 3D MASnI3 lattice. When the cation of en becomes part of the 3D structure, a high density of SnI2 vacancies is created resulting in larger band gap, larger unit cell volume, lower trap-state density, and much longer carrier lifetime compared to classical MASnI3. The best-performing {en}MASnI3 solar cell has achieved a high efficiency of 6.63% with an open circuit voltage of 428.67 mV, a short-circuit current density of 24.28 mA cm-2, and a fill factor of 63.72%. Moreover, the {en}MASnI3 device shows much better air stability than the neat MASnI3 device. Comparable performance is also achieved for cesium tin iodide solar cells with en loading, demonstrating the broad scope of this approach.

Original languageEnglish
Pages (from-to)14800-14806
Number of pages7
JournalJournal of the American Chemical Society
Volume139
Issue number41
DOIs
Publication statusPublished - Oct 18 2017

Fingerprint

Tin
Solar cells
Lead
Iodides
Cations
Positive ions
Air
Equipment and Supplies
Cesium
Carrier lifetime
Open circuit voltage
Cell Size
Electronic properties
Short circuit currents
Perovskite
Vacancies
Toxicity
Energy gap
Current density

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites. / Ke, Weijun; Stoumpos, Constantinos C.; Spanopoulos, Ioannis; Mao, Lingling; Chen, Michelle; Wasielewski, Michael R; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 139, No. 41, 18.10.2017, p. 14800-14806.

Research output: Contribution to journalArticle

Ke, Weijun ; Stoumpos, Constantinos C. ; Spanopoulos, Ioannis ; Mao, Lingling ; Chen, Michelle ; Wasielewski, Michael R ; Kanatzidis, Mercouri G. / Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites. In: Journal of the American Chemical Society. 2017 ; Vol. 139, No. 41. pp. 14800-14806.
@article{51e7e4653dd14c8ab95dde98d56d3541,
title = "Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites",
abstract = "Tin-based perovskites have very comparable electronic properties to lead-based perovskites and are regarded as possible lower toxicity alternates for solar cell applications. However, the efficiency of tin-based perovskite solar cells is still low and they exhibit poor air stability. Here, we report lead-free tin-based solar cells with greatly enhanced performance and stability using so-called {"}hollow{"} ethylenediammonium and methylammonium tin iodide ({en}MASnI3) perovskite as absorbers. Our results show that en can improve the film morphology and most importantly can serve as a new cation to be incorporated into the 3D MASnI3 lattice. When the cation of en becomes part of the 3D structure, a high density of SnI2 vacancies is created resulting in larger band gap, larger unit cell volume, lower trap-state density, and much longer carrier lifetime compared to classical MASnI3. The best-performing {en}MASnI3 solar cell has achieved a high efficiency of 6.63{\%} with an open circuit voltage of 428.67 mV, a short-circuit current density of 24.28 mA cm-2, and a fill factor of 63.72{\%}. Moreover, the {en}MASnI3 device shows much better air stability than the neat MASnI3 device. Comparable performance is also achieved for cesium tin iodide solar cells with en loading, demonstrating the broad scope of this approach.",
author = "Weijun Ke and Stoumpos, {Constantinos C.} and Ioannis Spanopoulos and Lingling Mao and Michelle Chen and Wasielewski, {Michael R} and Kanatzidis, {Mercouri G}",
year = "2017",
month = "10",
day = "18",
doi = "10.1021/jacs.7b09018",
language = "English",
volume = "139",
pages = "14800--14806",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "41",

}

TY - JOUR

T1 - Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites

AU - Ke, Weijun

AU - Stoumpos, Constantinos C.

AU - Spanopoulos, Ioannis

AU - Mao, Lingling

AU - Chen, Michelle

AU - Wasielewski, Michael R

AU - Kanatzidis, Mercouri G

PY - 2017/10/18

Y1 - 2017/10/18

N2 - Tin-based perovskites have very comparable electronic properties to lead-based perovskites and are regarded as possible lower toxicity alternates for solar cell applications. However, the efficiency of tin-based perovskite solar cells is still low and they exhibit poor air stability. Here, we report lead-free tin-based solar cells with greatly enhanced performance and stability using so-called "hollow" ethylenediammonium and methylammonium tin iodide ({en}MASnI3) perovskite as absorbers. Our results show that en can improve the film morphology and most importantly can serve as a new cation to be incorporated into the 3D MASnI3 lattice. When the cation of en becomes part of the 3D structure, a high density of SnI2 vacancies is created resulting in larger band gap, larger unit cell volume, lower trap-state density, and much longer carrier lifetime compared to classical MASnI3. The best-performing {en}MASnI3 solar cell has achieved a high efficiency of 6.63% with an open circuit voltage of 428.67 mV, a short-circuit current density of 24.28 mA cm-2, and a fill factor of 63.72%. Moreover, the {en}MASnI3 device shows much better air stability than the neat MASnI3 device. Comparable performance is also achieved for cesium tin iodide solar cells with en loading, demonstrating the broad scope of this approach.

AB - Tin-based perovskites have very comparable electronic properties to lead-based perovskites and are regarded as possible lower toxicity alternates for solar cell applications. However, the efficiency of tin-based perovskite solar cells is still low and they exhibit poor air stability. Here, we report lead-free tin-based solar cells with greatly enhanced performance and stability using so-called "hollow" ethylenediammonium and methylammonium tin iodide ({en}MASnI3) perovskite as absorbers. Our results show that en can improve the film morphology and most importantly can serve as a new cation to be incorporated into the 3D MASnI3 lattice. When the cation of en becomes part of the 3D structure, a high density of SnI2 vacancies is created resulting in larger band gap, larger unit cell volume, lower trap-state density, and much longer carrier lifetime compared to classical MASnI3. The best-performing {en}MASnI3 solar cell has achieved a high efficiency of 6.63% with an open circuit voltage of 428.67 mV, a short-circuit current density of 24.28 mA cm-2, and a fill factor of 63.72%. Moreover, the {en}MASnI3 device shows much better air stability than the neat MASnI3 device. Comparable performance is also achieved for cesium tin iodide solar cells with en loading, demonstrating the broad scope of this approach.

UR - http://www.scopus.com/inward/record.url?scp=85031755203&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85031755203&partnerID=8YFLogxK

U2 - 10.1021/jacs.7b09018

DO - 10.1021/jacs.7b09018

M3 - Article

VL - 139

SP - 14800

EP - 14806

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 41

ER -