TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: In preparing solar micro cell based on aligned carbon nanotube, the concentration of the carbon nanotube suspension is 0.1-1 mg/mL. The substrate indicates the silicon slice with an insulating layer of 2-5 microns thick on the surface; the insulating layer is made of one of silicon dioxide, aluminum oxide, silicon nitride, hafnium oxide, zirconium oxide, epoxy resin or polyimide. The non-symmetrical electrode pair is two metal electrodes with high and low work functions, respectively. The distance between the two metal electrodes with high and low work functions is 5 nm to 400 microns; and the relative widths of the two metal electrodes with high and low work functions are 10 nm to 10 mm. The frequency of the alternating bias voltage is 0.1 kHz to 10 GHz; the electric field is 0.5-100 V/micron; the deposition time is 5 seconds to 15 minutes; and the temperature is 0 to 90 degrees C. The removal method of heavy-current selective burning is as follows: applying a positive voltage to the metal electrode of low work function and a negative voltage to the metal electrode of high work function, where only every small backward current can flow by the semiconductor carbon nanotube because of its rectification characteristic and the metal carbon nanotube is selectively burnt to be removed through the large current flowing by; thus the semiconductor carbon nanotube is remained as the device functional region. The removal of methane plasma selective etching is as follows: placing the aligned carbon nanotube thin film in plasma mixed gas atmosphere and removing the metal carbon nanotube through the high temperature plasma etching. The plasma mixed gas atmosphere indicates the mixed gas of methane and argon based on the volumetric ratio of 1-4:1. The high temperature plasma processing is carried out through a plasma generator for 10-60 minutes at the temperature of 100-400 degrees C, the power of 400-100 W and the intensity of pressure in the reaction chamber of 30-200 Pa.