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13 results on '"Tress, Wolfgang R."'

2. Conformal quantum dot-SnO2 layers as electron transporters for efficient perovskite solar cells

Author

Kim, Minjin, Jeong, Jaeki, Lu, Haizhou, Lee, Tae Kyung, Eickemeyer, Felix T., Liu, Yuhang, Choi, In Woo, Choi, Seung Ju, Jo, Yimhyun, Kim, Hak-Beom, Mo, Sung-In, Kim, Young-Ki, Lee, Heunjeong, An, Na Gyeong, Cho, Shinuk, Tress, Wolfgang R., Zakeeruddin, Shaik M., Hagfeldt, Anders, Kim, Jin Young, Grätzel, Michael, Kim, Dong Suk, Kim, Minjin, Jeong, Jaeki, Lu, Haizhou, Lee, Tae Kyung, Eickemeyer, Felix T., Liu, Yuhang, Choi, In Woo, Choi, Seung Ju, Jo, Yimhyun, Kim, Hak-Beom, Mo, Sung-In, Kim, Young-Ki, Lee, Heunjeong, An, Na Gyeong, Cho, Shinuk, Tress, Wolfgang R., Zakeeruddin, Shaik M., Hagfeldt, Anders, Kim, Jin Young, Grätzel, Michael, and Kim, Dong Suk

Abstract

Improvements to perovskite solar cells (PSCs) have focused on increasing their power conversion efficiency (PCE) and operational stability and maintaining high performance upon scale-up to module sizes. We report that replacing the commonly used mesoporous-titanium dioxide electron transport layer (ETL) with a thin layer of polyacrylic acid-stabilized tin(IV) oxide quantum dots (paa-QD-SnO2) on the compact-titanium dioxide enhanced light capture and largely suppressed nonradiative recombination at the ETL-perovskite interface. The use of paa-QD-SnO2 as electron-selective contact enabled PSCs (0.08 square centimeters) with a PCE of 25.7% (certified 25.4%) and high operational stability and facilitated the scale-up of the PSCs to larger areas. PCEs of 23.3, 21.7, and 20.6% were achieved for PSCs with active areas of 1, 20, and 64 square centimeters, respectively.

Published
2022

3. Conformal quantum dot–SnO 2 layers as electron transporters for efficient perovskite solar cells

Author

Kim, Minjin, primary, Jeong, Jaeki, additional, Lu, Haizhou, additional, Lee, Tae Kyung, additional, Eickemeyer, Felix T., additional, Liu, Yuhang, additional, Choi, In Woo, additional, Choi, Seung Ju, additional, Jo, Yimhyun, additional, Kim, Hak-Beom, additional, Mo, Sung-In, additional, Kim, Young-Ki, additional, Lee, Heunjeong, additional, An, Na Gyeong, additional, Cho, Shinuk, additional, Tress, Wolfgang R., additional, Zakeeruddin, Shaik M., additional, Hagfeldt, Anders, additional, Kim, Jin Young, additional, Grätzel, Michael, additional, and Kim, Dong Suk, additional

Published
2022
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4. Vapor-assisted deposition of highly efficient, stable black-phase FAPbI 3 perovskite solar cells

Author

Lu, Haizhou, primary, Liu, Yuhang, additional, Ahlawat, Paramvir, additional, Mishra, Aditya, additional, Tress, Wolfgang R., additional, Eickemeyer, Felix T., additional, Yang, Yingguo, additional, Fu, Fan, additional, Wang, Zaiwei, additional, Avalos, Claudia E., additional, Carlsen, Brian I., additional, Agarwalla, Anand, additional, Zhang, Xin, additional, Li, Xiaoguo, additional, Zhan, Yiqiang, additional, Zakeeruddin, Shaik M., additional, Emsley, Lyndon, additional, Rothlisberger, Ursula, additional, Zheng, Lirong, additional, Hagfeldt, Anders, additional, and Grätzel, Michael, additional

Published
2020
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5. Phosphonic Acid Modification of the Electron Selective Contact: Interfacial Effects in Perovskite Solar Cells

Author

Hill, Rebecca B. M., primary, Turren-Cruz, Silver-Hamill, additional, Pulvirenti, Federico, additional, Tress, Wolfgang R., additional, Wieghold, Sarah, additional, Sun, Shijing, additional, Nienhaus, Lea, additional, Bawendi, Moungi, additional, Buonassisi, Tonio, additional, Barlow, Stephen, additional, Hagfeldt, Anders, additional, Marder, Seth R., additional, and Correa-Baena, Juan-Pablo, additional

Published
2019
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8. Cover Feature: Poly(ethylene glycol)-[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis (ChemSusChem 6/2018)

Author

Collavini, Silvia, primary, Saliba, Michael, additional, Tress, Wolfgang R., additional, Holzhey, Philippe J., additional, Völker, Sebastian F., additional, Domanski, Konrad, additional, Turren-Cruz, Silver H., additional, Ummadisingu, Amita, additional, Zakeeruddin, Shaik M., additional, Hagfeldt, Anders, additional, Grätzel, Michael, additional, and Delgado, Juan L., additional

Published
2018
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9. Poly(ethylene glycol)-[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Author

Collavini, Silvia, primary, Saliba, Michael, additional, Tress, Wolfgang R., additional, Holzhey, Philippe J., additional, Völker, Sebastian F., additional, Domanski, Konrad, additional, Turren-Cruz, Silver H., additional, Ummadisingu, Amita, additional, Zakeeruddin, Shaik M., additional, Hagfeldt, Anders, additional, Grätzel, Michael, additional, and Delgado, Juan L., additional

Published
2018
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10. A partially-planarised hole-transporting quart-p-phenylene for perovskite solar cells.

Author

Mora-Fuentes, Juan P., Cortizo-Lacalle, Diego, Collavini, Silvia, Strutyński, Karol, Tress, Wolfgang R., Saliba, Michael, Zakeeruddin, Shaik M., Kosta, Ivet, Melle-Franco, Manuel, Grätzel, Michael, Delgado, Juan Luis, and Mateo-Alonso, Aurelio

Abstract

Herein, we describe the synthesis of a hole transporting material based on a partially planarised quart-p-phenylene core incorporating tetraketal and diphenylamine substituents that show optimal energy levels and solubility for perovskite solar cell applications. The triple-cation perovskite devices incorporating such quart-p-phenylene derivatives show power-conversion efficiencies, short circuit currents, open circuit voltages, and fill factors that are comparable to those of spiro-OMeTAD. [ABSTRACT FROM AUTHOR]

Published
2019
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12. Phosphonic Acid Modification of the Electron Selective Contact: Interfacial Effects in Perovskite Solar Cells

Author

Hill, Rebecca B. M., Turren-Cruz, Silver-Hamill, Pulvirenti, Federico, Tress, Wolfgang R., Wieghold, Sarah, Sun, Shijing, Nienhaus, Lea, Bawendi, Moungi, Buonassisi, Tonio, Barlow, Stephen, Hagfeldt, Anders, Marder, Seth R., and Correa-Baena, Juan-Pablo

Subjects
interfaces, open-circuit voltage, hysteresis, solar cell stability, layers, oxide, stability, perovskite solar cells
Abstract

The role electron-transport layers (ETLs) play in perovskite solar cells (PSCs) is still widely debated. Conduction band alignment at the perovskite/ETL interface has been suggested to be an important role for the performance of the solar cells. However, little is known about the effects of work-function shifts on the solar-cell performance, and specifically, the open-circuit voltage (V-OC). Here, the effects of surface modification of SnO2 ETLs using polar phosphonic acids are investigated, including the effects on work function, surface energy, device performance, and device stability in inert atmosphere. The phosphonic acid modifications did not have a large effect on V-OC; however, a sharp decrease in the overall device performance was found, mostly due to reduced fill factors. When exposed to conditions of low oxygen concentration, the phosphonic acid surface modified devices yielded current-voltage (J-V) curves with considerably lower hysteresis than those based on unmodified SnO2. This suggests that this modification method may be valuable for achieving stabilized power conversion efficiency without hysteresis.

13. Dopant-Free Hole-Transporting Polymers for Efficient and Stable Perovskite Solar Cells

Author

Valero, Silvia, Collavini, Silvia, Volker, Sebastian F., Saliba, Michael, Tress, Wolfgang R., Zakeeruddin, Shaik M., Gratzel, Michael, and Luis Delgado, Juan

Subjects
highly efficient, layer, stability
Abstract

A series of novel polymers (P1P6) derived from the combination of different units (including thiophene, triarylamine, and spirobifluorene) were successfully synthesized, completely characterized, and used as hole-transporting materials (HTMs) for perovskite solar cells (PSCs). Solar cells with some of these materials as HTMs showed very good performances of almost 13% (12.75% for P4 and 12.38% for P6) even without additives, and devices based on these new HTMs show relatively improved stability against temperature compared to those based on PTAA. The presence of dopant additives has been linked to long-term degradation, which is the main barrier to the large-scale commercialization of this innovative type of solar cell. Obtaining efficient PSCs without using dopants could represent a further step toward improvement of long-term stability and thus their introduction into the market.

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