Is Excess PbI2 Beneficial for Perovskite Solar Cell Performance?. Issue 7 (13th January 2016)
- Record Type:
- Journal Article
- Title:
- Is Excess PbI2 Beneficial for Perovskite Solar Cell Performance?. Issue 7 (13th January 2016)
- Main Title:
- Is Excess PbI2 Beneficial for Perovskite Solar Cell Performance?
- Authors:
- Liu, Fangzhou
Dong, Qi
Wong, Man Kwong
Djurišić, Aleksandra B.
Ng, Annie
Ren, Zhiwei
Shen, Qian
Surya, Charles
Chan, Wai Kin
Wang, Jian
Ng, Alan Man Ching
Liao, Changzhong
Li, Hangkong
Shih, Kaimin
Wei, Chengrong
Su, Huimin
Dai, Junfeng - Abstract:
- Abstract : Unreacted lead iodide is commonly believed to be beneficial to the efficiency of methylammonium lead iodide perovskite based solar cells, since it has been proposed to passivate the defects in perovskite grain boundaries. However, it is shown here that the presence of unreacted PbI2 results in an intrinsic instability of the film under illumination, leading to the film degradation under inert atmosphere and faster degradation upon exposure to illumination and humidity. The perovskite films without lead iodide have improved stability, but lower efficiency due to inferior film morphology (smaller grain size, the presence of pinholes). Optimization of the deposition process resulted in PbI2 ‐free perovskite films giving comparable efficiency to those with excess PbI2 (14.2 ± 1.3% compared to 15.1 ± 0.9%) Thus, optimization of the deposition process for PbI2 ‐free films leads to dense, pinhole‐free, large grain size perovskite films which result in cells with high efficiency without detrimental effects on the film photostability caused by excess PbI2 . However, it should be noted that for encapsulated devices illuminated through the substrate (fluorine‐doped tin oxide glass, TiO2 film), film photostability is not a key factor in the device degradation. Abstract : PbI2 residue‐containing perovskite films are intrinsically unstable under illumination. While the excess PbI2 improves the cell efficiency due to improved perovskite layer morphology, optimization of theAbstract : Unreacted lead iodide is commonly believed to be beneficial to the efficiency of methylammonium lead iodide perovskite based solar cells, since it has been proposed to passivate the defects in perovskite grain boundaries. However, it is shown here that the presence of unreacted PbI2 results in an intrinsic instability of the film under illumination, leading to the film degradation under inert atmosphere and faster degradation upon exposure to illumination and humidity. The perovskite films without lead iodide have improved stability, but lower efficiency due to inferior film morphology (smaller grain size, the presence of pinholes). Optimization of the deposition process resulted in PbI2 ‐free perovskite films giving comparable efficiency to those with excess PbI2 (14.2 ± 1.3% compared to 15.1 ± 0.9%) Thus, optimization of the deposition process for PbI2 ‐free films leads to dense, pinhole‐free, large grain size perovskite films which result in cells with high efficiency without detrimental effects on the film photostability caused by excess PbI2 . However, it should be noted that for encapsulated devices illuminated through the substrate (fluorine‐doped tin oxide glass, TiO2 film), film photostability is not a key factor in the device degradation. Abstract : PbI2 residue‐containing perovskite films are intrinsically unstable under illumination. While the excess PbI2 improves the cell efficiency due to improved perovskite layer morphology, optimization of the deposition leads to lead iodide‐free films with improved photostability and high efficiency. However, compared to photodegradation, other processes are more important in device degradation. … (more)
- Is Part Of:
- Advanced energy materials. Volume 6:Issue 7(2016)
- Journal:
- Advanced energy materials
- Issue:
- Volume 6:Issue 7(2016)
- Issue Display:
- Volume 6, Issue 7 (2016)
- Year:
- 2016
- Volume:
- 6
- Issue:
- 7
- Issue Sort Value:
- 2016-0006-0007-0000
- Page Start:
- n/a
- Page End:
- n/a
- Publication Date:
- 2016-01-13
- Subjects:
- organometallic halide perovskite -- solar cells -- stability -- XRD
Energy harvesting -- Materials -- Periodicals
Energy conversion -- Materials -- Periodicals
Energy storage -- Materials -- Periodicals
Photovoltaics -- Periodicals
Fuel cells -- Periodicals
Thermoelectric materials -- Periodicals
621.31 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1614-6840/ ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1002/aenm.201502206 ↗
- Languages:
- English
- ISSNs:
- 1614-6832
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 0696.850700
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British Library HMNTS - ELD Digital store - Ingest File:
- 2673.xml