IEC TS 63202-3:2023

IEC TS 63202-3 ®
Edition 1.0 2023-02
TECHNICAL
SPECIFICATION
colour
inside
Photovoltaic cells –
Part 3: Measurement of current-voltage characteristics of bifacial photovoltaic
cells
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IEC TS 63202-3 ®
Edition 1.0 2023-02
TECHNICAL
SPECIFICATION
colour
inside
Photovoltaic cells –
Part 3: Measurement of current-voltage characteristics of bifacial photovoltaic

cells
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-6415-7

– 2 – IEC TS 63202-3:2023 © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Methods . 7
4.1 General . 7
4.2 Double-side simultaneous irradiation . 8
4.3 Equivalent irradiation . 8
4.4 Sequential irradiation . 10
5 Apparatus . 11
5.1 General . 11
5.2 Double-side simultaneous irradiation . 11
5.3 Equivalent irradiation . 11
5.4 Sequential irradiation . 12
6 Procedures . 12
6.1 General . 12
6.2 Double-side simultaneous irradiation . 12
6.2.1 Requirements for calibration . 12
6.2.2 Procedures . 13
6.3 Equivalent irradiation . 13
6.3.1 Requirements for calibration . 13
6.3.2 Procedures . 13
6.4 Sequential irradiation . 14
6.4.1 Requirements for calibration . 14
6.4.2 Procedures . 14
7 Report . 15
Annex A (normative) Determination of bifacial I-V characteristics . 16
A.1 General . 16
A.2 Shift approximation . 16
A.3 Linear interpolation . 17

Figure 1 – Schematic procedure of double-side simultaneous irradiation method with
integrated flash conditions . 8
Figure 2 – Schematic procedure of equivalent irradiation method with sequential flash
conditions . 9
Figure 3 – Schematic procedure of equivalent irradiation method with integrated flash
conditions . 10
Figure 4 – Schematic procedure of sequential irradiation method with integrated flash
conditions . 10
Figure 5 – Separate solar simulator on both front and rear side for double-side
simultaneous irradiation . 11
Figure 6 – Setup for equivalent irradiation with adjustable intensity . 12
Figure 7 – Schematic configuration with two consecutive solar simulators . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC CELLS –
Part 3: Measurement of current-voltage
characteristics of bifacial photovoltaic cells

FOREWORD
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IEC TS 63202-3 has been prepared by IEC technical committee 82: Solar photovoltaic energy
systems. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
82/2070/DTS 82/2094/RVDTS
82/2094A/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.

– 4 – IEC TS 63202-3:2023 © IEC 2023
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at https://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at https://www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 63202 series, published under the general title Photovoltaic cells,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

PHOTOVOLTAIC CELLS –
Part 3: Measurement of current-voltage
characteristics of bifacial photovoltaic cells

1 Scope
This part of IEC 63202 describes procedures for the measurement of current-voltage (I-V)
characteristics of crystalline silicon bifacial photovoltaic (PV) cells for both laboratory and mass
production applications.
This document is intended to be used for measurement of individual unencapsulated bifacial
PV cells, in addition to the requirements described in IEC 60904-1 and differentiating from
IEC TS 60904-1-2 which is more applicable to encapsulated PV device. Specific requirements
on bifacial reference cells and calibration of solar simulators are also defined to provide useful
guidance for the proposed methods.
The bifacial I-V characteristics contain front standard test condition (STC), rear STC and bifacial
STC results for the bifacial PV cells under test. Thus, bifaciality as well as the power generation
capability under single-side or bifacial irradiation are evaluated.
NOTE This document does not apply to tandem or multi-junction bifacial PV cells.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this
...