China’s 13th Five-Year Plan for solar – a look at 2017 and beyond

By Frank Haugwitz, Frank Haugwitz is an expert on PV and renewable energy in China. Based in Beijing since 2002, he founded and directs Asia Europe Clean Energy (Solar) Advisory (AECEA), a consultancy working to help European and Asian companies understand Chinese renewable energy regulation and policy. Since 2013 he has been the elected vice chairman of the Renewable Energy Working Group of the European Chamber of Commerce in China.

Market update | At the end of 2016 China published a long-awaited plan that will determine the course of PV deployment for the next five years. China solar industry expert Frank Haugwitz unpicks the plan and assesses the country’s chances of surpassing 100GW of capacity this year.

Financing Southeast Asian solar

Finance | The emerging solar markets of Southeast Asia each present their own unique set of conditions from a financing perspective. Reporting back from the Solar Finance & Investment Southeast Asia conference in Thailand at the end of 2016, Tom Kenning looks at how a promising solar region is bringing in the investors.

Built tough for Taiwan

System integration | Taiwan has set itself a target of 20GW of PV by 2025, but standing in the way of that are acute land shortages and some extreme weather conditions. Tom Kenning reports on the creative technological and construction solutions being found to address Taiwan’s unique challenges.

New approaches to solar O&M in China

By Karl Hong Wan, Karl Hong Wan attended the graduate school of Southeast University in China, majoring in electrical engineering, power system measurement and intelligent instruments. He has been engaged in the design, construction and operation of power substations, power plants and renewable energy generation for 30 years. He currently works in the design and research institute of GCL New Energy

Operations & maintenance | Proposals by Chinese authorities to scale back the subsidies available for grid-tied PV will require new efforts to maximise the performance of power plants. Karl Hong Wan of the GCL Design & Research Institute explores some of the innovations in O&M practices that will help China’s solar industry cope with decreasing financial support.

Analysis and outlook of near-industrial PERC solar cells

By Pierre Saint-Cast, Sven Wasmer, Johannes Greulich, Sabrina Werner, Ulrich Jäger*, Elmar Lohmüller, Hannes Höffler & Ralf Preu,, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, Germany. *Now with RENA Technologies GmbH, Gütenbach, Germany

This paper presents an in-depth analysis of state-of-the-art p-type monocrystalline Czochralski-grown silicon passivated emitter and rear cells (PERCs) fabricated in a near-industrial manner. PERC solar cells feature a homogeneous emitter on the front side, and an Al2O3 passivation layer and local contacts on the rear side.

PID –1,500V readiness of PV modules: Some solutions and how to assess them in the lab

By Benoit Braisaz1, Benjamin Commault2,3, Nam Le Quang4, Samuel Williatte4, Marc Pirot2,3, Eric Gerritsen2,3, Maryline Joanny2,3, Didier Binesti1, Thierry Galvez4, Gilles Goaer4 & Khalid Radouane, 1EDF R&D, ENERBAT, F-77250 Moret sur Loing; 2Univ. Grenoble Alpes, INES, Le Bourget du Lac; 3CEA, LITEN, Le Bourget du Lac; 4EDF ENR PWT, Bourgoin-Jallieu; 5EDF EN, La Défense, France

Even though it is now more than five years since potential-induced degradation (PID) began to proliferate, and despite the fact that solutions are under development, it is currently still the most discussed mode of degradation associated with cracking in PV modules.

Salvador Ponce-Alcántara & Guillermo Sánchez,

By Salvador Ponce-Alcántara & Guillermo Sánchez,, Valencia Nanophotonics Technology Center – UPV, Spain

Conventional ribbons used for interconnecting solar cells in PV modules act like mirrors, causing a large proportion of incident light to be lost. Experimental results indicate that only around 5% of the perpendicular incident light on the connections can be reused; as a result, this area contributes very little, if at all, to the current generation.

High-performance screen-printable pastes for HJT cells

By Stefan Körner & Markus Eberstein,, Fraunhofer IKTS, Dresden, Germany

A highly promising concept for future solar cells is the heterojunction (HJT) architecture; according to the ITRPV roadmap 2016, the market share for HJT solar cells will increase to 10% by 2026. Over this timescale, stabilized cell efficiency will increase to 24%, which is the second-highest predicted efficiency after backcontact cells with n-type mono-Si. Moreover, metallization of HJT cells offers the advantage of using low-temperature steps, which reduces energy consumption and hence production costs.

Cu-plated electrodes with laser contact opening on n-type crystalline silicon solar cells

By Kuang-Chieh Lai, Yueh-Lin Lee, Ming-Shiou Lin, Chia-Chih Chuang, Chi-Chun Li & Chien-Chun Wang,, Motech Industries, Inc., Tainan, Taiwan

This paper presents the fabrication of front-junction n-type silicon solar cells with Cu-plated electrodes, using laser contact opening and forward-bias plating. The cells feature a back-surface field formed by a phosphorus implant, and a diffused boron emitter with aluminium oxide passivation. Laser ablation of the front-side dielectric layers is followed by a metallization based on Ni/Cu forward-bias plating, while sintered metal paste is used for the rear electrode. The results show improved line conductivity and contact resistivity for the plated electrode, leading to higher solar cell efficiency than for cells made with conventional Ag/Al paste. On 6" n-type Czochralski wafers, cell efficiencies of up to 21.3% have been demonstrated, with an open-circuit voltage of 654mV, a short-circuit current of 40.8mA/cm2 and a fill factor of 79.8%.

Use of a perovskite layer to boost the efficiency of CIGS modules

By Tom Aernouts, imec, Leuven, Belgium

Perovskite microcrystals have properties that make them uniquely suitable as a basis of thin, light, semitransparent solar modules. However, there are some remaining challenges, including lifelong stability, that need to be tackled before this technology can become commercially available.

Due diligence for financing of PV assets

By Simon Turner and Paola Piazzolla

Project finance - Minimising risk to lenders is vital in ensuring the solar industry continues to have access to adequate sources of finance. Simon Turner and Paola Piazzolla outline the key ingredients for the technical due diligence needed to give peace of mind to investors.

MENA means business

By Danielle Ola, Editor, PV Tech

Market overview - A number of false dawns have so far prevented solar from living up to its full potential in the Middle East and North Africa. But as Danielle Ola reports, with all the right ingredients in place, and an increasingly competitive business environment, the prospects in the region look better than ever before.

BIPV: Living up to expectations

By Ben Willis, Editor, PV Tech

Building integrated PV: Despite plenty of hype, BIPV has remained a niche segment in the solar business, held back by a combination of high costs and low efficiencies. But as Ben Willis hears, the high-profile entry of Tesla on to the BIPV scene could herald the start of a new era for the sector.

Properties of encapsulation materials and their relevance for quality control and recent field failures

By Juliane Berghold and Tsuyoshi Shioda

Module defects: The properties of module encapsulant materials are coming under closer scrutiny as their role in a number of common field failures becomes better understood. Juliane Berghold and Tsuyoshi Shioda report on new testing methods being developed to analyse the composition of encapsulants and improve the quality control of this crucial material.