Abstract
In Sn-based halide perovskite solar cells (PSCs), the oxidation of Sn 2+ to Sn 4+ under ambient air leads to unwanted p-type doping in the perovskite film, which is a main reason for increased background carrier density and low efficiency. Here, we find that the introduction of bromide into formamidinium tin iodide (CH(NH 2 ) 2 SnI 3 , FASnI 3 ) lattice significantly lowers the carrier density of perovskite absorber, which is thought to be a result of reduction of Sn vacancies. It reduces the leakage current of devices, increases recombination lifetime, and finally improves open-circuit voltage and fill factor of the resulting devices employing mesoporous TiO 2 as an electron transport layer. Consequently, a high power conversion efficiency (PCE) of 5.5% is achieved with an average PCE of 5%, and after encapsulation the devices are highly stable over 1000 h under continuous one sun illumination including the ultraviolet region. This study suggests a simple approach for improving stability and efficiency in FASnI 3 -based PSCs.
| Original language | English |
|---|---|
| Pages (from-to) | 46-53 |
| Number of pages | 8 |
| Journal | ACS Energy Letters |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2018 Jan 12 |
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ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Materials Chemistry
Cite this
Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells. / Lee, Seon Joo; Shin, Seong Sik; Im, Jino; Ahn, Tae Kyu; Noh, Jun Hong; Jeon, Nam Joong; Seok, Sang Il; Seo, Jangwon.
In: ACS Energy Letters, Vol. 3, No. 1, 12.01.2018, p. 46-53.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Reducing Carrier Density in Formamidinium Tin Perovskites and Its Beneficial Effects on Stability and Efficiency of Perovskite Solar Cells
AU - Lee, Seon Joo
AU - Shin, Seong Sik
AU - Im, Jino
AU - Ahn, Tae Kyu
AU - Noh, Jun Hong
AU - Jeon, Nam Joong
AU - Seok, Sang Il
AU - Seo, Jangwon
PY - 2018/1/12
Y1 - 2018/1/12
N2 - In Sn-based halide perovskite solar cells (PSCs), the oxidation of Sn 2+ to Sn 4+ under ambient air leads to unwanted p-type doping in the perovskite film, which is a main reason for increased background carrier density and low efficiency. Here, we find that the introduction of bromide into formamidinium tin iodide (CH(NH 2 ) 2 SnI 3 , FASnI 3 ) lattice significantly lowers the carrier density of perovskite absorber, which is thought to be a result of reduction of Sn vacancies. It reduces the leakage current of devices, increases recombination lifetime, and finally improves open-circuit voltage and fill factor of the resulting devices employing mesoporous TiO 2 as an electron transport layer. Consequently, a high power conversion efficiency (PCE) of 5.5% is achieved with an average PCE of 5%, and after encapsulation the devices are highly stable over 1000 h under continuous one sun illumination including the ultraviolet region. This study suggests a simple approach for improving stability and efficiency in FASnI 3 -based PSCs.
AB - In Sn-based halide perovskite solar cells (PSCs), the oxidation of Sn 2+ to Sn 4+ under ambient air leads to unwanted p-type doping in the perovskite film, which is a main reason for increased background carrier density and low efficiency. Here, we find that the introduction of bromide into formamidinium tin iodide (CH(NH 2 ) 2 SnI 3 , FASnI 3 ) lattice significantly lowers the carrier density of perovskite absorber, which is thought to be a result of reduction of Sn vacancies. It reduces the leakage current of devices, increases recombination lifetime, and finally improves open-circuit voltage and fill factor of the resulting devices employing mesoporous TiO 2 as an electron transport layer. Consequently, a high power conversion efficiency (PCE) of 5.5% is achieved with an average PCE of 5%, and after encapsulation the devices are highly stable over 1000 h under continuous one sun illumination including the ultraviolet region. This study suggests a simple approach for improving stability and efficiency in FASnI 3 -based PSCs.
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UR - http://www.scopus.com/inward/citedby.url?scp=85040612411&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.7b00976
DO - 10.1021/acsenergylett.7b00976
M3 - Article
AN - SCOPUS:85040612411
VL - 3
SP - 46
EP - 53
JO - ACS Energy Letters
JF - ACS Energy Letters
SN - 2380-8195
IS - 1
ER -