Stand­ard CIGS sol­ar cells util­ize molyb­denum as a back-con­tact elec­trode and reach 23% effi­ciency. How­ever, in order to sur­pass this PCE level and approach Schockley-Queis­s­er lim­it, a paradigm change is pos­tu­lated using an altern­at­ive sol­ar cell structure.
The goal of Hi-BITS Pro­ject is to devel­op a nov­el CIGS sol­ar cell archi­tec­ture with trans­par­ent back-con­tact elec­trode that could replace molyb­denum in the future.

Optic­al trans­par­ency in visu­al and near-infrared part of the sol­ar spec­trum will allow absorp­tion from both sides of the device, fur­ther boost­ing the max­im­al, achiev­able effi­ciency. This will open new applic­a­tion pos­sib­il­it­ies for CIGS tech­no­logy. Back con­tact pas­siv­a­tion can also reduce thick­ness of the absorp­tion lay­er, decreas­ing pro­duc­tion cycle time and mater­i­al utilization.

Nov­el sol­ar cell struc­ture is going to be tested in four dif­fer­ent sol­ar mod­ule pro­to­types: bifa­cial mod­ules, mod­ules with integ­rated back-reflect­or, semi-trans­par­ent mod­ules and tan­dem mod­ules. Pro­to­types are going to be tested in out­door con­di­tions at four dif­fer­ent sites across Europe.


Main tasks of Rol­tec in the project:

  • Laser struc­tur­ing of pro­to­type mod­ules and sol­ar cells,
  • Encap­su­la­tion of pro­to­type modules,
  • Semi-trans­par­ent sol­ar cells (Rol­tec is a task leader),
  • Com­pli­ance of pro­to­types with norms and dir­ect­ives (Rol­tec is a task leader).

The main task of Rol­tec in Hi-BITS pro­ject is laser struc­tur­ing, encap­su­la­tion and integ­ra­tion of pro­to­type mod­ules and sol­ar cells. Addi­tion­ally, Rol­tec is respons­ible for pre­par­ing a report on com­pli­ance of pro­to­type mod­ules with EU norms and dir­ect­ives in the con­text of sev­er­al tar­geted applic­a­tions, e.g. BIPV, agrophotovoltaics.

More inform­a­tion on  hi-bits.eu.

Hi-BITS Pro­ject in numbers:

Pro­ject partners:

  • Inter­na­tion­al Iberi­an Nan­o­tech­no­logy Labor­at­ory (INL)
  • French Nation­al Centre for Sci­entif­ic Research (CNRS)
  • Cen­ter for Sol­ar Energy and Hydro­gen Research Baden‑Württem­berg (ZSW)
  • Uppsala uni­ver­sity (UU)
  • Swiss Fed­er­al Labor­at­or­ies for Mater­i­als Sci­ence and Tech­no­logy (EMPA)
  • Uni­ver­sity of Lux­em­burg (uni.lu)
  • Cata­lonia Insti­tute for Energy Research (IREC)
  • Mar­tin Luth­er Uni­ver­sity Halle-Wit­ten­berg (MLU)
  • Mid­sum­mer AB (MIDS)
  • Sun­plugged – Sol­are Ener­giesysteme GmbH (SUN)
  • GreenDelta GmbH (GDL)
  • Saint Gobain Recher­che (SG)
  • Avan­cis GmbH (AVA)

Fun­ded by the European Uni­on. Pro­gram: HORIZON, Grant ID: 101122203.
Fun­ded by the European Uni­on. Views and opin­ions expressed are how­ever those of the author(s) only and do not neces­sar­ily reflect those of the European Uni­on. Neither the European Uni­on nor the grant­ing author­ity can be held respons­ible for them.