TY - JOUR
T1 - Understanding the Degradation of Spiro-OMeTAD-Based Perovskite Solar Cells at High Temperature
AU - Tumen-Ulzii, Ganbaatar
AU - Qin, Chuanjiang
AU - Matsushima, Toshinori
AU - Leyden, Matthew R.
AU - Balijipalli, Umamahesh
AU - Klotz, Dino
AU - Adachi, Chihaya
N1 - Funding Information:
The authors thank Ms. Nozomi Nakamura for her assistance for DSC measurements. This work was supported by the Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project (JST ERATO grant no. JPMJER1305); the International Institute for Carbon‐Neutral Energy Research (WPI‐ICNER) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; JSPS KAKENHI (grant nos. JP15K14149, JP16H04192, and 20H02817); the Canon Foundation; and the Samco Foundation. 2
Funding Information:
The authors thank Ms. Nozomi Nakamura for her assistance for DSC measurements. This work was supported by the Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project (JST ERATO grant no. JPMJER1305); the International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; JSPS KAKENHI (grant nos. JP15K14149, JP16H04192, and 20H02817); the Canon Foundation; and the Samco Foundation.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Organic–inorganic halide perovskites are promising as the light absorber of solar cells because of their efficient solar power conversion. An issue frequently occurring in perovskite solar cells (PSCs) with a hole transport layer of N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) is a quick performance degradation at high temperature. Herein, it is discovered that postdoping of the spiro-OMeTAD layer by iodine released from the perovskite layer is one possible mechanism for the high-temperature PSC degradation. Iodine doping leads to the highest occupied molecular orbital level of the spiro-OMeTAD layer becoming deeper and, therefore, induces the formation of an energy barrier for hole extraction from the perovskite layer. It is demonstrated that it is possible to suppress the high-temperature degradation by using an iodine-blocking layer or an iodine-free perovskite in PSCs. These findings will guide the way for the realization of thermally stable perovskite optoelectronic devices in the future.
AB - Organic–inorganic halide perovskites are promising as the light absorber of solar cells because of their efficient solar power conversion. An issue frequently occurring in perovskite solar cells (PSCs) with a hole transport layer of N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) is a quick performance degradation at high temperature. Herein, it is discovered that postdoping of the spiro-OMeTAD layer by iodine released from the perovskite layer is one possible mechanism for the high-temperature PSC degradation. Iodine doping leads to the highest occupied molecular orbital level of the spiro-OMeTAD layer becoming deeper and, therefore, induces the formation of an energy barrier for hole extraction from the perovskite layer. It is demonstrated that it is possible to suppress the high-temperature degradation by using an iodine-blocking layer or an iodine-free perovskite in PSCs. These findings will guide the way for the realization of thermally stable perovskite optoelectronic devices in the future.
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U2 - 10.1002/solr.202000305
DO - 10.1002/solr.202000305
M3 - Article
AN - SCOPUS:85089383936
SN - 2367-198X
VL - 4
JO - Solar RRL
JF - Solar RRL
IS - 10
M1 - 2000305
ER -