Sanyo Electric Maruyama said: “The remaining increase of several percentage points of conversion efficiency issues facing has made it clear, as long as existing technology will be able to take the time to expand steadily to achieve.” Range of specific improvements are as follows: to reduce the impact of the shadow of electrodes about 5% inhibition transparent conductive film and light absorption of amorphous silicon layer of about 5%, inhibit amorphous silicon Toshiba Dynabook UX battery and crystalline silicon interface defect-induced carrier recombination number%. The maximum value of utility of these methods alone can be realized. Prior to this, to improve conversion efficiency has been using these methods. If the present rate increase, then the 2015 or so, laboratories, the conversion efficiency will reach 25 ~ 26% (Figure 2).

HIT solar cell close to the theoretical limit of Sanyo Electric’s “HIT (Heterojunction with Intrinsic Thin layer) solar battery,” is expected to be achieved within the next few years, crystalline silicon solar battery to the limit. Sanyo Electric for the 2009 data. Photo: “Nikkei Micro Devices.”

What is the ultimate solar battery look like? In the NEDO’s “innovative solar Toshiba NB200 battery energy technology research and development” program, three research teams competing to come up with more than 40% conversion efficiency for solar battery form the research results (Figure 3). The three were the hope of drawing the use of quantum effects, multi-junction technology and the condensing unit and use, the introduction of new materials and light management technology, independently developed high efficiency solar battery. Whose common denominator is to fully utilize previously unavailable Toshiba Satellite A105 battery large-scale wavelengths.

Combination of various types of technology to improve the efficiency of NEDO (New Energy and Industrial Technology Development Organization) and “innovative solar energy technology research and development” program being developed by solar cell sample. The goal is to mix all kinds of technology, take full advantage of a wide range of wavelengths of light, in order to achieve ultra-efficient. The figure in brackets for the Toshiba Satellite A100 battery material bandgap. “Nikkei Micro Devices” According to the information produced NEDO.