Photovoltaic & Optoelectronic Device Group

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Device Performance of Emerging Photovoltaic Materials (Version 2)

Advanced Energy Materials Wiley 11:48 (2021)

Authors:

Osbel Almora, Derya Baran, Guillermo C Bazan, Christian Berger, Carlos I Cabrera, Kylie R Catchpole, Sule Erten鈥怑la, Fei Guo, Jens Hauch, Anita WY Ho鈥怋aillie, T Jesper Jacobsson, Rene AJ Janssen, Thomas Kirchartz, Nikos Kopidakis, Yongfang Li, Maria A Loi, Richard R Lunt, Xavier Mathew, Michael D McGehee, Jie Min, David B Mitzi, Mohammad K Nazeeruddin, Jenny Nelson, Ana F Nogueira, Ulrich W Paetzold, Nam鈥怗yu Park, Barry P Rand, Uwe Rau, Henry J Snaith, Eva Unger, L铆dice Vaillant鈥怰oca, Hin鈥怢ap Yip, Christoph J Brabec

Er@C82 as a Bifunctional Additive to the Spiro鈥怬MeTAD Hole Transport Layer for Improving Performance and Stability of Perovskite Solar Cells

Solar RRL Wiley 5:12 (2021)

Authors:

Xiaoqin Ye, Pengwei Yu, Wangqiang Shen, Shuaifeng Hu, Takeshi Akasaka, Xing Lu

Self鈥怉ssembled Perovskite Nanoislands on CH3NH3PbI3 Cuboid Single Crystals by Energetic Surface Engineering

Advanced Functional Materials Wiley 31:50 (2021)

Authors:

Yurou Zhang, Dohyung Kim, Jung鈥怘o Yun, Jongchul Lim, Min鈥怌herl Jung, Xiaoming Wen, Jan Seidel, Eunyoung Choi, Mu Xiao, Tengfei Qiu, Miaoqiang Lyu, EQ Han, Mehri Ghasemi, Sean Lim, Henry J Snaith, Jae Sung Yun, Lianzhou Wang

Self鈥怉ssembled Perovskite Nanoislands on CH3NH3PbI3 Cuboid Single Crystals by Energetic Surface Engineering (Adv. Funct. Mater. 50/2021)

Advanced Functional Materials Wiley 31:50 (2021)

Authors:

Yurou Zhang, Dohyung Kim, Jung鈥怘o Yun, Jongchul Lim, Min鈥怌herl Jung, Xiaoming Wen, Jan Seidel, Eunyoung Choi, Mu Xiao, Tengfei Qiu, Miaoqiang Lyu, EQ Han, Mehri Ghasemi, Sean Lim, Henry J Snaith, Jae Sung Yun, Lianzhou Wang

Phase segregation in mixed-halide perovskites affects charge-carrier dynamics while preserving mobility

Nature Communications Springer Nature 12 (2021) 6955

Authors:

Silvia G Motti, Jay B Patel, Robert DJ Oliver, Henry J Snaith, Michael B Johnston, Laura M Herz

Abstract:

Mixed halide perovskites can provide optimal bandgaps for tandem solar cells which are key to improved cost-efficiencies, but can still suffer from detrimental illumination-induced phase segregation. Here we employ optical-pump terahertz-probe spectroscopy to investigate the impact of halide segregation on the charge-carrier dynamics and transport properties of mixed halide perovskite films. We reveal that, surprisingly, halide segregation results in negligible impact to the THz charge-carrier mobilities, and that charge carriers within the I-rich phase are not strongly localised. We further demonstrate enhanced lattice anharmonicity in the segregated I-rich domains, which is likely to support ionic migration. These phonon anharmonicity effects also serve as evidence of a remarkably fast, picosecond charge funnelling into the narrow-bandgap I-rich domains. Our analysis demonstrates how minimal structural transformations during phase segregation have a dramatic effect on the charge-carrier dynamics as a result of charge funnelling. We suggest that because such enhanced recombination is radiative, performance losses may be mitigated by deployment of careful light management strategies in solar cells.