Synergistic improvements in stability and performance of lead iodide perovskite solar cells incorporating salt additives
The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These al...
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| Published in | Journal of materials chemistry. A, Materials for energy and sustainability Vol. 4; no. 5; pp. 1591 - 1597 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2016
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| Subjects | |
| Online Access | Get full text |
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| Abstract | The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb
2+
ions and enhance the crystal growth of PbI
2
films, resulting in nanostructured morphologies. The nanostructured PbI
2
films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%-from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days.
Alkali metal halide additives chelate with Pb
2+
ions during film formation promoting homogeneous nucleation, which greatly enhances the power conversion efficiency (15.08%) and stability (over 50 days) of planar perovskite solar cells. |
|---|---|
| AbstractList | The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb
2+
ions and enhance the crystal growth of PbI
2
films, resulting in nanostructured morphologies. The nanostructured PbI
2
films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%—from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days. The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb²⁺ ions and enhance the crystal growth of PbI₂ films, resulting in nanostructured morphologies. The nanostructured PbI₂ films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%—from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days. The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb2+ ions and enhance the crystal growth of PbI2 films, resulting in nanostructured morphologies. The nanostructured PbI2 films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%-from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days. The main issues in planar perovskite solar cells are the coverage and crystallinity of the perovskite film on the PEDOT:PSS layer. To enhance these features, we introduced alkali metal halides (salts) as additives into the perovskite precursor solution used in a two-step preparation method. These alkali metal halides chelate with Pb 2+ ions and enhance the crystal growth of PbI 2 films, resulting in nanostructured morphologies. The nanostructured PbI 2 films promote homogeneous nucleation and larger crystallite sizes, thereby enhancing the morphology and crystallinity of the perovskite films. The alkali metal halides recrystallize the small grains and passivate the grain boundaries and interface states, allowing effective charge generation and dissociation in perovskite films. Photoluminescence measurements indicated that perovskite films prepared with salt additives featured fewer charge traps and defects. The power conversion efficiency of the device incorporating a small amount of a salt additive increased by approximately 33%-from 11.4 to 15.08%. This device was more stable than a corresponding device prepared without the additive, with only 16.5% degradation occurring over a period of 50 days. Alkali metal halide additives chelate with Pb 2+ ions during film formation promoting homogeneous nucleation, which greatly enhances the power conversion efficiency (15.08%) and stability (over 50 days) of planar perovskite solar cells. |
| Author | Mohan, Ramesh Ho, Kuo-Chuan Budiawan, Widhya Lee, Chih-Hao Chu, Chih-Wei Boopathi, Karunakara Moorthy Huang, Tzu-Yen Lin, Ming-Yi |
| AuthorAffiliation | Taiwan International Graduate Program National Taiwan University Department of Engineering and Systems Science Nano Science and Technology Program National Tsing Hua University Academia Sinica Academia Sinica and National Tsing Hua University Research Center for Applied Science Department of Chemical Engineering |
| AuthorAffiliation_xml | – sequence: 0 name: National Tsing Hua University – sequence: 0 name: Nano Science and Technology Program – sequence: 0 name: Taiwan International Graduate Program – sequence: 0 name: Academia Sinica – sequence: 0 name: Department of Engineering and Systems Science – sequence: 0 name: National Taiwan University – sequence: 0 name: Research Center for Applied Science – sequence: 0 name: Academia Sinica and National Tsing Hua University – sequence: 0 name: Department of Chemical Engineering |
| Author_xml | – sequence: 1 givenname: Karunakara Moorthy surname: Boopathi fullname: Boopathi, Karunakara Moorthy – sequence: 2 givenname: Ramesh surname: Mohan fullname: Mohan, Ramesh – sequence: 3 givenname: Tzu-Yen surname: Huang fullname: Huang, Tzu-Yen – sequence: 4 givenname: Widhya surname: Budiawan fullname: Budiawan, Widhya – sequence: 5 givenname: Ming-Yi surname: Lin fullname: Lin, Ming-Yi – sequence: 6 givenname: Chih-Hao surname: Lee fullname: Lee, Chih-Hao – sequence: 7 givenname: Kuo-Chuan surname: Ho fullname: Ho, Kuo-Chuan – sequence: 8 givenname: Chih-Wei surname: Chu fullname: Chu, Chih-Wei |
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| SubjectTerms | Additives Alkali metals Charge crystal structure crystallites Devices dissociation Halides ions lead Morphology Nanostructure Perovskites photoluminescence small cereal grains solar cells |
| Title | Synergistic improvements in stability and performance of lead iodide perovskite solar cells incorporating salt additives |
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