HEMP 2015

Date: 10th-11th September

Location: G41 Lecture Theatre, Royal School of Mines, Imperial College London, South Kensington 

Co-organised by MultiscaleSolar





Supported by the IOP Semiconductor Physics Group and Materials and Characterisation Group.

Maps and travel information are available from the Imperial College campus information page.

The HEMP workshop series started in 2011 and tackles a range of topics associated with high- effi ciency PV research. Each year has a principle topic, but the programme is not exclusive. In previous years HEMP themes have included the intermediate band solar cell, the hot carrier solar cell and the application of nanophotonics in photovoltaics. HEMP 2015 will bring together researchers working on highly mismatched alloys for PV, bridging the gap between materials fabrication and characterisation, device design and theory on a multiscale level. Participants will present the state of the art results in their respective fields and share the difficulties they are facing, spot the missing information that is necessary in order to design efficient solar cells, and establish collaborative activity to achieve the next stage in the development of these materials for photovoltaic devices.

Contact Diego Alonso Álvarez for further information.


  • The workshop, including reception, coffee breaks and posters, will take place in the G41 Lecture Theatre, Royal School of Mines.

  • A PDF version of the program including the abstracts and posters can be downloaded from here


Thursday 10th of September

 9:00   Reception and morning coffee
 9:45 Ned Ekins-Daukes(Imperial College London, UK)  Welcome and introduction
10:00 Andrew Johnson (IQE plc, UK) 

Novel Materials & Architectures for Very High Efficiency Multi-Junction Solar Cells – A Manufacturing Perspective

10:30  Tomos Thomas (Imperial College London, UK)

GaAsSbN 1-eV solar cells as a component in lattice-matched GaAs-based multi-junction cells

11:00   Coffee break and posters
11:30  Eoin O'Reilly (Tyndall National Institute, Irland) 

Band structure engineering of dilute bismide alloys for photovoltaic applications

12:15  Stephen Sweeney (University of Surrey, UK)

Bismide alloys for applications in photonic devices

12:45    Lunch break (free time)
13:30    Coffee break and posters
14:15  Mircea Guina (Tampere University of Technology, Finland) 

III-N/Bi-V based high efficiency solar cells: recent developments and future prospects

15:00  John David (University of Sheffield, UK) Bismuth Alloys for Photovoltaic Applications
15:30    Coffee break and posters
16:00  Louise Hirst (Naval Research Laboratory, USA) 

Development of InAlAsSb for photovoltaic applications: Mind the miscibility gap

16:30  Stanko Tomic (University of Salford, UK)  

Highly mismatched alloys as absorbing material in IBSC and conventional single gap solar cells

17:00   End of the day


Friday 11th of September

 9:00   Reception and morning coffee
 9:30 Vesselin Donchev (Sofia University, Bulgaria)  Surface photovoltage  spectroscopy – a handy tool for characterization of semiconductor materials and nanostructures
10:00 Nair López (Universidad Autónoma de Madrid, Spain)

Dilute nitrides for intermediate band solar cells

10:30  Urs Aeberhard (Forsh ungszentrum Jülich, Germany)

Photovoltaics at the nanoscale: limits of the semi-classical picture

11:30  Takashi Kita (Kobe University, Japan) 

Carrier Dynamics in InA s /GaAs Quantum Dot Superlattices for Photovoltaics

12:00  Sabina Hatch (University College London, UK)

Overcoming the challenges facing quantum dot solar cells


Kasidit T oprasertpong (University of Tokyo, Japan)

Potential of quantum structures towards lattice-matched 4-junction solar cells

13:00   End of the day