Highly Accurate Measurements for a Worldwide PV Community

Transcription

1 Highly Accurate Measurements for a Worldwide PV Community Developments in Perovskite Solar Cell Measurements at Fraunhofer ISE CalLab PV Cells Markus Mundus, Bhavana Venkataramanachar, Jochen Hohl-Ebinger, Wilhelm Warta Fraunhofer Institute for Solar Energy Systems ISE SNEC 2017 Shanghai,

2 AGENDA Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Advanced Setups for Advanced Characterization Towards Reliable Perovskite Solar Cell (PSC) Measurements External Quantum Efficiency Current-Voltage Measurements Maximum-Power-Point-Tracking 2

3 Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Traceability and Quality Assurance Certified ISO Calibration Lab Regular International Round Robins Round Robin 3

4 Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Traceability and Quality Assurance Certified ISO Calibration Lab Regular International Round Robins Selection of Solar Cells measured at CalLab PV Cells Silicon (mono/multi) Busbarless and bifiacial Perovskite Thin-Film (a-si, CI(G)S, CdTe, CZTS ) Organic & dye-sensitized III/V & Concentrator & Space Multi-junction 4

5 Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Traceability and Quality Assurance Certified ISO Calibration Lab Regular International Round Robins Improving Methods & Setups Solar Simulator F. Peter, Diploma Thesis, University Freiburg (2014) Reference Solar Cells H. Seifert, PhD Thesis, University Konstanz (2015) 5

6 Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Traceability and Quality Assurance Certified ISO Calibration Lab Regular International Round Robins Improving Methods & Setups Solar Simulator F. Peter, Diploma Thesis, University Freiburg (2014) Reference Solar Cells H. Seifert, PhD Thesis, University Konstanz (2015) Developing New Methods & Setups Spectrally Shaped Supercontinuum M. Mundus et al., EUPVSEC

7 Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Traceability and Quality Assurance Certified ISO Calibration Lab Regular International Round Robins Improving Methods & Setups Solar Simulator F. Peter, Diploma Thesis, University Freiburg (2014) Reference Solar Cells H. Seifert, PhD Thesis, University Konstanz (2015) Developing New Methods & Setups Spectrally Shaped Supercontinuum M. Mundus et al., EUPVSEC 2015 Laser-based EQE Setup M. Mundus, PhD Thesis, University Konstanz (2016) 7

8 Fraunhofer ISE CalLab PV Cells Advanced Setups for Advanced Characterization Real-time Monitoring Perovskite Crystallization [1] 2-steps process with MAI dipping Simultaneous EQE at 350nm and 700nm Contributions from DSSC and PSC EQE MAI solution Crystallization completed after 15 min 8 [1] L. Wagner, L. Mundt et al., In-Situ Monitoring of Photovoltaic Evolvement during Perovskite Crystallization, submitted to Advanced Energy Materials

9 AGENDA Fraunhofer ISE CalLab PV Cells Dedicated to High Accuracy in Measurements Advanced Setups for Advanced Characterization Towards Reliable Perovskite Solar Cell (PSC) Measurements External Quantum Efficiency Current-Voltage Measurements Maximum-Power-Point-Tracking 9

10 Towards Reliable PSC Measurements External Quantum Efficiency EQE Typical assumption: EQE = differential EQE Wrong! For high accuracy: in-depth analysis of differential EQE Wrong! MM [1] IV eta no shadow mask used 10 [1] M. Mundus et al., Nonlinearity and Temperature Dependence of Perovskite Solar Cells, to be submitted.

11 Towards Reliable PSC Measurements External Quantum Efficiency EQE [1] Typical assumption: EQE = differential EQE Wrong! For high accuracy: in-depth Don t adjust analysis solar of simulator differential EQE Differential EQE and J to SC vary a differential with bias irradiance Jsc! EQE at 0 and 1 sun bias irradiance is not true device EQE MM IV eta no shadow mask used 11 [1] M. Mundus et al., Nonlinearity and Temperature Dependence of Perovskite Solar Cells, to be submitted.

12 Towards Reliable PSC Measurements Current-Voltage Measurement EQE Measure IV curve of PSC MM IV eta 12

13 Towards Reliable PSC Measurements Current-Voltage Measurement EQE Measure IV curve of PSC in both directions Hysteresis impedes reliable efficiency measurement MPP-Tracking required! MM IV MPP eta 13

14 Towards Reliable PSC Measurements Maximum-Power-Point-Tracking EQE Measure IV curve of PSC in both directions Hysteresis impedes reliable efficiency measurement MPP-Tracking required! Estimated MPP MM IV MPP eta 14

15 Towards Reliable PSC Measurements Maximum-Power-Point-Tracking EQE Measure IV curve of PSC in both directions Hysteresis impedes reliable efficiency measurement MPP-Tracking required! MM IV Now routinely applied at Fraunhofer ISE CalLab PV Cells MPP eta 15

16 Conclusions Thanks to Robert Gehlhaar (Imec), Markus Kohlstädt (FMF) you for your attention! Highly accurate measurements by CalLab PV Cells In-depth investigation of perovskite properties Crystallization dynamics Nonlinearity differential J SC =/= J SC Certified PSC measurements possible at 16