TY - JOUR
T1 - High Built-in Potential Perovskite Solar Cells Realized by Incorporating a Hybrid Hole Extraction Layer
AU - Syed, Ali Asgher
AU - Cai, Linfeng
AU - Zhu, Furong
N1 - Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, NSFC/RGC Joint Research Scheme (N_HKBU201/19), Collaborative Research Fund (C5037‐18GF), and General Research Fund (12302419).
PY - 2020/11
Y1 - 2020/11
N2 - The performance of perovskite solar cells (PSCs) has been improved substantially over the past few years. However, the related fundamental understanding of improving the built-in potential on the efficiency of the PSCs is still far from adequate. A combination of morphology, charge extraction, and built-in potential studies would help us to gain an insight on efficient operation of the PSCs. Herein, the effect of the hybrid hole extraction layer (HEL), comprising a mixture of tungsten oxide (WO3) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) (WO3–PEDOT:PSS), on the growth of the perovskite photoactive layer and built-in potential in PSCs is investigated using structural analyses, photoelectron spectroscopy, and transient photocurrent (TPC) measurements. It shows that the use of hybrid HEL is an effective approach for enhancing the built-in potential across the photoactive layer in the PSCs, leading to >20% increase in power conversion efficiency as compared to that of a control PSC prepared using a pristine PEDOT:PSS HEL. PSCs with a higher built-in potential are favorable for efficient cell operation, as manifested by the charge extraction analyses and TPC measurements.
AB - The performance of perovskite solar cells (PSCs) has been improved substantially over the past few years. However, the related fundamental understanding of improving the built-in potential on the efficiency of the PSCs is still far from adequate. A combination of morphology, charge extraction, and built-in potential studies would help us to gain an insight on efficient operation of the PSCs. Herein, the effect of the hybrid hole extraction layer (HEL), comprising a mixture of tungsten oxide (WO3) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) (WO3–PEDOT:PSS), on the growth of the perovskite photoactive layer and built-in potential in PSCs is investigated using structural analyses, photoelectron spectroscopy, and transient photocurrent (TPC) measurements. It shows that the use of hybrid HEL is an effective approach for enhancing the built-in potential across the photoactive layer in the PSCs, leading to >20% increase in power conversion efficiency as compared to that of a control PSC prepared using a pristine PEDOT:PSS HEL. PSCs with a higher built-in potential are favorable for efficient cell operation, as manifested by the charge extraction analyses and TPC measurements.
KW - built-in potentials
KW - charge extractions
KW - hybrid hole extraction layers
KW - perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85089884419&partnerID=8YFLogxK
U2 - 10.1002/solr.202000393
DO - 10.1002/solr.202000393
M3 - Journal article
AN - SCOPUS:85089884419
SN - 2367-198X
VL - 4
JO - Solar RRL
JF - Solar RRL
IS - 11
M1 - 2000393
ER -