Prof Henry Snaith FRS: Publications

Dye Monolayers Used as the Hole Transporting Medium in Dye‐Sensitized Solar Cells

Advanced Materials Wiley 27:39 (2015) 5889-5894

Authors:

Davide Moia, Tomas Leijtens, Nakita Noel, Henry J Snaith, Jenny Nelson, Piers RF Barnes

Mapping Electric Field‐Induced Switchable Poling and Structural Degradation in Hybrid Lead Halide Perovskite Thin Films

Advanced Energy Materials Wiley 5:20 (2015)

Authors:

Tomas Leijtens, Eric T Hoke, Giulia Grancini, Daniel J Slotcavage, Giles E Eperon, James M Ball, Michele De Bastiani, Andrea R Bowring, Nicola Martino, Konrad Wojciechowski, Michael D McGehee, Henry J Snaith, Annamaria Petrozza

Stability of Metal Halide Perovskite Solar Cells

Advanced Energy Materials Wiley 5:20 (2015)

Authors:

Tomas Leijtens, Giles E Eperon, Nakita K Noel, Severin N Habisreutinger, Annamaria Petrozza, Henry J Snaith

Charge-Carrier Dynamics and Mobilities in Formamidinium Lead Mixed-Halide Perovskites

Advanced Materials Wiley (2015) n/a-n/a

Authors:

Waqaas Rehman, Rebecca L Milot, Giles E Eperon, Christian Wehrenfennig, Jessica L Boland, Henry J Snaith, Michael B Johnston, Laura Herz

Abstract:

The mixed-halide perovskite FAPb(BryI1–y)3 is attractive for color-tunable and tandem solar cells. Bimolecular and Auger charge-carrier recombination rate constants strongly correlate with the Br content, y, suggesting a link with electronic structure. FAPbBr3 and FAPbI3 exhibit charge-carrier mobilities of 14 and 27 cm2 V−1 s−1 and diffusion lengths exceeding 1 μm, while mobilities across the mixed Br/I system depend on crystalline phase disorder.

Quantum funneling in blended multi-band gap core/shell colloidal quantum dot solar cells

Applied Physics Letters American Institute of Physics 107:10 (2015) 103902-103902

Authors:

Darren CJ Neo, Samuel D Stranks, Giles Eperon, Henry J Snaith, Hazel Assender, Andrew AR Watt

Abstract:

Multi-band gap heterojunction solar cells fabricated from a blend of 1.2 eV and 1.4 eV PbS colloidal quantum dots (CQDs) show poor device performance due to non-radiative recombination. To overcome this, a CdS shell is epitaxially formed around the PbS core using cation exchange. From steady state and transient photoluminescence measurements, we understand the nature of charge transfer between these quantum dots. Photoluminescence decay lifetimes are much longer in the PbS/CdS core/shell blend compared to PbS only, explained by a reduction in non-radiative recombination resulting from CdS surface passivation. PbS/CdS heterojunction devices sustain a higher open-circuit voltage and lower reverse saturation current as compared to PbS-only devices, implying lower recombination rates. Further device performance enhancement is attained by modifying the composition profile of the CQD species in the absorbing layer resulting in a three dimensional quantum cascade structure.

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