PHOTOCELL RECEIVER-CONVERTER OF LASER RADIATION Russian patent published in 2016 - IPC H01L31/04 

FIELD: electricity; optical system.

SUBSTANCE: invention relates to designing of receivers-converters based on semiconductor photocells (PC). Photocell of a laser radiation receiver-converter comprises semiconductor alloyed and basic layers of p-type and n-type, a front strip ohmic contact on the front side of the photocell made in the form of alternating strips with constant spacing of strips Δ and width of strips b, a continuous ohmic contact on the rear side of the photocell and protective optical coating, on which there normally fall beams of laser with a wave length of λ₀; at that, the protective optical coating applied on the working surface of semiconductor with an absolute refraction index n is made by layers in the form of an antireflection coating with thickness δ, comparable with wavelength λ₃ in antireflection coating and with absolute refraction index n₃<n, connected through an adhesive layer with thickness d and with absolute refraction index n₂ with thermotaxic coating with thickness Η and with absolute refraction index n₁, wherein on the inner surface of the thermotaxic coating there are frontally made unsealed alternating grooves with constant pitch Δ and depth h<H, cross-section of which has the shape of an isosceles triangle with base b, aligned during imposition with width of strips of the strip ohmic contact of the photocell, and with apex angle of 2γ=2·arctg[b/(2·h)], while the planes of side faces of the grooves are made with maximum high coefficient of mirror reflection, wherein the photocell with layers of protective optical coating should comply with a certain ratio.

EFFECT: invention increases efficiency and specific values of photocurrent PET due to increased share of the absorbed radiation flux, which correspondingly increases the total number of photoelectrons and photoholes generated by radiation during a time unit at both sides of p-n junction, as well as due to increasing the path passed by radiation in the photoactive region of the photocell, which allows to reduce its thickness and thereby to increase the coefficient of collecting current carriers and to improve energy-mass indices of the receiver-converter.

1 cl, 3 dwg