Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Diagnostic current-voltage (I‑V) measurements on perovskite solar cells are challenging due to an inherent electrical polarisation that occurs under voltage bias [1]. This polarisation means the electrical behaviour of the device is usually dependent on either the exposure history of the device, the parameters of the measurement, or both. Measurements of perovskite cell efficiency using standard practices are therefore fraught with very high uncertainty, even when the I‑V data appear repeatable. This issue is entirely separate to the issue of device stability (degradation) which further complicates the measurement for many devices.
The International Electrotechnical Commission (IEC) publishes the internationally accepted standard method (IEC 60904) for measuring solar PV device output, and this standard is in the process of being updated. To that end, significant effort by a large group of stakeholders has been invested in understanding the perovskite polarisation issue, such that the 60904 or related standards might accommodate the issue. With support of the Australian Renewable Energy Agency (ARENA), CSIRO has studied the perovskite measurement issue extensively and is contributing strongly to the IEC standardisation effort.
In 2017, CSIRO published results from the first part of the project, including a world-first perovskite cell measurement round-robin including all eight Australian PV research labs plus a major international test lab) [2] and a novel approach to dealing with device polarisation during I‑V curve measurement. In 2018, the remaining project work will be presented, including:
- Improvements in perovskite solar cell performance
- A second major round-robin experiment
- Development of a 3D-printable standard device package compliant with the World PV Scale-
- Development of a IEC Technical Report on measurement protocols for emerging PV technologies as part of an international project team. That document is designed to pave the way for a Technical Specification and ultimately a dedicated standard
- Follow-on work on tandem cells with perovskite layers will be introduced.
This work was supported by ARENA, the Australian Renewable Energy Agency.
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